Why is this C expression yielding the wrong answer?

为什么这是C的表达产生错误的答案？

youdao

My watch didn't go wrong after the rain because it was C. waterproof.

我的表淋过雨后没有坏，因为它是防水的。

youdao

My watch didn't go wrong after the rain because it was C. waterproof.

我的表淋过雨后没有坏，因为它是防水的。

youdao