So, even if the speed is constant, that means, even if a length of the velocity vector stays the same, the velocity vector can still rotate.

因此即使速率不变，也就是说速度矢量的的大小不变，但它的方向可以做旋转。

youdao

One is I keep a constant, and then of course b will have to change because if this width stays the same, then when I change theta, the height increases, and then this side length increases.

一个是我保持a恒定,那么当然b就会变化，因为这个宽是不变的。,那么当改变θ角时，高度增加了，从而这条边的长度增加了。

youdao

The Centre for Mental health found that one such initiative in Birmingham reduced the length of hospital stays and the number of readmissions and improved the health and well-being of patients.

心理健康中心发现，伯明翰的一项此类实验减少了病人住院时间长度和再次入院的次数，并且提高病人的健康和幸福感。

youdao

It is not clear how much the apartment-rental program will cost, a FEMA spokeswoman said, because the length of stays and rents will vary from family to family.

WSJ: FEMA to Move Sandy Victims to Apartments

It is believed that maggot therapy can potentially save the NHS a great deal of cash by cutting the length of hospital stays, and substantially reducing the number of expensive dressings used.

BBC: Patients wanted for maggots trial

Foundation trusts cut the length of hospital stays in 2004-05, whereas it rose among other hospitals (see chart).

ECONOMIST: National Health Service