正交轨线的问题一直处于沉寂状态.The subject of orthogonal trajectories remained dormant.20天的轨线有时辰有用, 可是从15年前开始就走下坡路了.Twenty - day trajectories worked for a whellole, but that started going downhelloll 15 years ago.最后给出了与子午线交定角的轨线方程的解法.F...
He must have climbed out of his cot.他肯定是从婴儿床里爬出来的。The baby is fast asleep in his cot.婴儿在他的小床上熟睡着。Put a selection of baby toys in his cot to amuse him if he wakes early.要在婴儿床里放一些玩具，以便他醒得早时可以自己玩。Doctors still aren't s...