In colder weather, your cat will curl up into a tight, heat-conserving ball.天气更冷时，猫会为了保存热量而紧紧地缩成一团。A blow to the stomach made him curl up.他腹部受到一击而直不起腰来.On the battlefield such a coward like him would surely lie down and ...
长途驾驶时，腰部的支撑十分重要。Lumbar support is very important if you're driving a long way.双手置于腰部，吸气。Place your hands on the small of your back and breathe in.他的名牌套装在腰部起了褶皱。His designer suits ruck up round his middle....
The two particles will undergo accelerations as a result of their interaction.这两个粒子由于相互作用将获得加速度.Since the cord connecting the two blocks is inextensible, the accelerations are the same.由于连接两物块的绳子无伸缩性, 因此它们的加速度相同.Vibratio...
In the 1790s Tom Paine taught plebeian radicals that mankind would live in harmony were it not for the vested interest which princes, diplomats and soldiers had in promoting wars to enrich themselves.汤姆·潘恩在18世纪90年代教育平民激进...