She's always full of surprises.

她老是做些出人意料的事。

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Biology is always full of surprises.

生物学总是充满着惊异。

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Sometimes, these men can be very unpredictable but they are always full of surprises.

有时他让你捉摸不透，但总是让你充满惊喜。

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Business deals in China are always full of surprises, because, until the transaction is finally concluded and the goods or service paid for and consumed or performed, no one can be ever quite sure that all the details of the transaction have been settled, and that there will be no misunderstandings.

NPR: Cracking the China Market, Then and Now