The body must return identically to its original condition when the loads are released.当去掉载荷时,物体必须恢复到与原来完全一样的状态.The motion is periodic, which means it occurs identically over and over again.这个运动是周期的, 意即运动以同样的形式重复出现.The w...
The problem was to safeguard sites from encroachment by property development.问题是要保护遗址免受房地产开发商的侵占。Many people took second jobs as a safeguard against unemployment.许多人为防失业都干两份工作。to safeguard a person's interests维护某人的利...
She crawled on all fours over to the window.她爬到窗边。They looked rather comical as they crawled up precarious ladders.他们顺着摇摇晃晃的梯子往上爬，看起来非常滑稽。She crawled onto the river bank and lay there gulping in air.她爬上河岸,躺在那里喘着粗气.I lite...