大多数野生水獭已经从人口稠密的地区消失了，更不用说荒野区域了。

Most wild otters have disappeared from populated areas, ___to ___say ___nothing ___of wilderness regions.

仅通过其烹饪来评判一个国家的文化是困难的，且不说这类评判的主观性。

It is difficult to judge a country's culture by its cuisine alone, ___to ___say ___nothing ___of the subjective nature of such judgements.

在周五前完成主报告将很有挑战性，更别说她额外要求的那些幻灯片了。

Finishing the main report by Friday will be challenging, ___to ___say ___nothing ___of the additional slides she requested.