overestimate

It is dangerous to overestimate your swimming abilities when venturing into deep, rough ocean waters.

(Chinese) 当冒险进入深而汹涌的海域时，高估自己的游泳能力是危险的。

The company's managers failed because they tended to overestimate the public demand for their product.

(Chinese) 公司经理们失败了，因为他们往往高估了公众对他们产品的需求。