at a low ebb

in a poor state

處于低潮，處于衰退期

the country was at a low ebb due to the recent war.

由于最近的戰(zhàn)爭(zhēng)，該國(guó)處于衰退期。

ebb and flow

a recurrent or rhythmical pattern of coming and going or decline and regrowth

漲落；興衰；消長(zhǎng)