近年来客流量的突然锐减是一个危险的警告，尽管它并没有伴随实体销售的大幅下降。
The sudden decline in foot traffic in recent years, even though it hasn't been accompanied by a massive decline in physical sales, is a critical warning.
育空河的鱼群在上个世纪九十年代后期突然锐减，今年的数量仍然很低，商业捕捞已经被禁止。
Stocks in the Yukon River crashed in the late-1990s and are so low this year that commercial fishing has been banned.
育空河的鱼群在上个世纪九十年代后期突然锐减，今年的数量仍然很低，商业捕捞已经被禁止。
Stocks in the Yukon River crashed in the late-1990s and are so low this year that commercial fishing has been banned.
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