这条裤子是前开口。

The trousers have a fly fastening.

《牛津词典》

型井架主体结构为前开口形轻便井架，整体分为四段，有锥销连接，具有拆除方便、整体稳定性强的特点。

The major structure of K-type Mast is open-face mast, and the body is divided into four sections, which are connected by tapers and convenient to be dismantled with good stability.

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另一个暗示：你倾向于在开口说话前仔细地思考。

Another hint: you're inclined to think carefully before you speak.

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