free fall
参考词典中free fall的常规释义：
基本释义
- n.自由降落(尤指降落伞张开前的降落),(尤指火箭等的)惯性运动
英英解释
2个名词解释
- the ideal falling motion of something subject only to a gravitational field
- a sudden sharp decrease in some quantity
[同] dip, drop, fall, free fall
[例]- a drop of 57 points on the Dow Jones index
- there was a drop in pressure in the pulmonary artery
- a dip in prices
- when that became known the price of their stock went into free fall
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