1·The book is full, you will see, of a number of descents and ascents.
你们将会读到，本书充满一些下降与上升的句子。
2·Previous rovers have deployed parachutes to slow their descents, and have then crashed into the ground using airbags to cushion their impacts.
先前的探测器使用降落伞降低下降时的速度，砸向地面时有安全气囊缓冲撞击的影响。
3·The functional formalism for the effective potential is briefly reviewed for the case of a scalar field theory by using the method of steepest descents.
本文首先在标量场论的情形下，用最速下降法对有效势的泛函形式作了简要的评论。