Moreover, it had to be borne in mind that the hugest whales, those found near the Aleutian, Kulammak, and UmgullichIslands, have never been longer than 180 feet, if that.
if that 是什么结构?
if that 是英语习语,通常不必作进一步分析。它用来表示最大值,一般用于句尾,放在表示数量的短语后。在本句中相当于if (they are as long as) that. 请看the free dictionary 的解释:https://idioms.thefreedictionary.com/if+that
再请看维基词典的解释:https://en.wiktionary.org/wiki/if_that
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