falling-off

n.

下降，减退；

1. The elephant population in that area is falling.
   那个地区的大象总数在下降。
2. This could help explain our falling divorce rate.
   这刚好能解释英国的离婚率为什么在下降。
3. Their enthusiasm seems to be falling off a bit.
   他们的热情似乎有点减退。
4. Interest in the book began to drop off.
   人们对这本书的兴趣开始减退了。

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