To begin with, we need an alarm_event_t structure, zeroed out.
首先，我们需要一个 alarm_event_t结构，对它清零。
When we had all zeroed in our guns on the enemy post, we opened fire.
我们把枪都瞄准了敌人的哨所，开火了。
The children zeroed in on the display of toys in the store window.
孩子们的注意力都集中在商店橱窗里陈列的玩具上。
The cannon is zeroed in on a certain target.
大炮对准一个确定的目标。
The cannon is zeroed in on a certain target.
大炮对准一个确定的目标。
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