The revenue from tourism is the biggest single item in the country's invisible earnings.

旅游业收入是该国无形收益当中最大的一项。

柯林斯例句

This is offset, however, by invisible earnings, to which the main contributor is tourism.

但这一逆差依靠无形收入 —— 主要是旅游业, 得到了补偿.

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