坍落度的英文：
slump constant

slump是什么意思：
v. 下跌；衰落；下降；（使）倒下
n. 骤降，猛跌，锐减；萧条期；衰退

She slumped into a chair.
她轰然倒在了椅子上。

Gill was dwelling on the consequences of the slump.
吉尔一直在考虑这衰退的后果。

Net profits slumped by 41%.
净利润暴跌了41%。

The slump in global manufacturing seems to be easing.
全球制造业的衰退似乎也正在减缓。

If the slump continues, more men will be stood off.
如果经济萧条持续下去，将有更多的人被解雇。

constant是什么意思：
adj. 固定的；不停的，接连不断的
n. 常数；不变的事物

Matter is in constant motion and constant change.
物质总是在不断运动，不断变化的。

A constant guest is never welcome
常客令人厌

The market is in a constant state of flux.
市场行情在不断变化。

The market is a stream that is in constant motion.
市场像河流一样不断地波动。

The speed of light is an invariant constant.
光速是一个不变常数。