单词：tack about
tack about的用法和样例：
例句
- By tacking about, we were able to avoid the enemy guns.我们摆动着船帆不停地调转船头，才得以躲过敌人的炮弹。
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今天要讲的两个习惯用语都指在某一事务中举足轻重的实质性问题。先要学的习惯用语是： brass tack。Brass是金灿灿的黄铜，实际上黄铜是铜和锌这两种金属的合金，而tack是又小又尖的平头钉。
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