With the caveat that almost every figure in this survey is suspect, it can at least be said that the world travel and tourism industry is huge.

尽管事先声明此项调查报告中的每个数字都不可靠，但至少可以说，世界旅游观光业的市场庞大。

There was one caveat: he was not to enter into a merger or otherwise weaken the Roche family's control of the firm.

有一点需要预先声明：他不得参与合并，或以其他方式削弱罗奇家族对该公司的控制。