The teacher clucked sympathetically at the child's story.对那小孩讲述的遭遇，老师啧啧地表示同情。Ducks clucked under the docks with a ducker in duck ducking into the dark.鸭子在码头下面咯咯叫,养鸭人一弯腰隐入黑暗中。Chickens clucked in the garden.鸡在花园里咯咯叫。T...
存在着许多势能和动能的能源.There exist many sources of energy both potential and kinetic.最大势能和总能量是 多少 ?What are the maximum potential energy and the total energy?因此,我们可以说,该系统有内势能.We can therefore say that the system has internal pote...
The jam fault of the differentiator is dangerous to steam turbine.微分器卡涩对汽轮机正常运行有较大的危害.By using differentiator series method, the formula of partial integration is obtained.用微分算子级数法得到分部积分公式,使一类积分计算变得十分简单.To enhance the an...
你脸上的抓痕是怎么来的?How did you come by that scratch on your cheek?小偷带着浑身的抓痕和青肿逃之夭夭.The thief got away , but not without some scratches and bruises.他脸上有道深深的抓痕.He has a deep scratch on his face....