一 | BRUSSELS -- For the first time, Ukraine President Volodymyr Zelenskyy joined a meeting of more than 50 defense leaders from around the world Wednesday to make a personal pitch for military aid, in the face of lagging political support in the U.S. and new pressure on allies to send weapons to bolster Israel’s war with Hamas.His presence underscored growing concerns about cracks in what has been staunch international backing for Kyiv in its war against Russia's invasion, and worries that Ukrainian forces haven't made measurable progress in the counteroffensive, as winter closes in.“Next Monday, we will mark the 600th day of our resistance to Russia’s full scale aggression against our people, against Ukraine. And today, no one can say for sure how many more days we will have to defend our independence and to defend our identity,” Zelenskyy told the gathering as they opened the meeting. “But we can already say several things which I think are important. First, Putin will not achieve Ukraine. Second, Russia cannot afford a new arms race. And third, democracy can win this battle.”The meeting of the Ukraine Defense Contact Group, hosted by the U.S., comes as Ukraine is desperately seeking more weapons to help its troops regain ground from Russian forces before the muddy weather sets in. But political chaos in Congress stalled approval of new Ukraine funding, and there has been growing opposition among some lawmakers to any increase in spending. Speaking as he entered NATO headquarters, Zelenskyy noted the Israel war, and said Ukrainians understand such tragedy. But he was also quick to detail Ukraine's ongoing need for air defense systems and long-range missiles “to push Russia out of our land.”U.S. Defense Secretary Lloyd Austin told reporters traveling with him to Brussels that support for Ukraine continues unabated. He said a number of allies will announce they are sending additional weapons and other support to Kyiv. A key demand has been more air defense systems and munitions.“The energy, in my view, is still there,” said Austin. “And I will reassure them that we remain committed to this.”He echoed those thoughts as he opened the meeting, asserting that Ukraine is making steady progress in the war. And he said allies during this meeting will focus not only on meeting Kyiv's immediate needs but also on setting up plans to coordinate investments in Ukraine's future forceThe contact group is the main forum for raising contributions of weapons, equipment and training for Kyiv’s war effort. It meets about once a month, in person and virtually, and this is the 16th gathering.Zelenskyy, who was greeted with applause as he entered the building, went immediately into a private session with Austin and U.S. Air Force Gen. CQ Brown, chairman of the Joint Chiefs of Staff.Speaking to reporters as he came in, Zelenskyy reiterated his country's need for long-range missiles and ammunition.“It’s very important that there are priorities. There are air defense systems. These are not just basic words. These are very concrete things and we need them,” Zelenskyy said.Following that meeting, the 31 allies and Ukraine will take part in the first NATO-Ukraine Council at this level. The forum was formally established in July as part of efforts to bring Kyiv closer to the alliance. It allows NATO and Kyiv to discuss issues of common interest and concern.The new package of U.S. aid includes AIM-9M missiles for air defense, counter-drone systems, munitions for the High Mobility Artillery Rocket System (HIMARS), artillery, electronic warfare equipment, demolition munitions, anti-armor systems and more than 16 million rounds of small arms ammunition.The weapons are provided under presidential drawdown authority, so will be taken from Pentagon stocks and delivered quickly to the battlefield. ___Follow AP’s coverage of the war in Ukraine at https://apnews.com/hub/russia-ukraine。科学家们不知道为什么地球磁场运动得很快。
二 | 研究人员说，磁极正在从加拿大“滑翔”到西伯利亚。磁北极的运动是显而易见的，世界各地的研究人员都渴望更新世界地磁模型。世界地磁模型是所有现代导航系统的基础，包括海军导航系统和手机上的谷歌地图。
三 | 最新的世界地磁模型，于2015年出版，相信到2020年可以使用。但研究人员说，磁场变化如此之快，他们必须提前修改世界地磁模型。世界地磁模型原定于1月15日更新，但由于美国政府的关闭，时间不得不推迟到1月30日。地磁场在不断变化。
四 | 小科学普及：地磁极（来自维基百科）人类首先根据地球两极的方向来定义磁铁的南北极，而不是相反：磁铁的北极是指磁针自由旋转时转向地磁北极的末端。由于两块磁铁的南北极相互吸引，这就意味着地磁场的北极实际上是地磁场的南极（即地磁场线指向地球中心的地方）。南北磁极一般位于地极附近，但其位置随地质时间的变化而变化较大。这种变化太慢，无法干扰罗盘的日常使用。然而，平均每几十万年就会发生一次地磁反转，即南北极突然（与地质时间尺度相比）相互交换。
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