Flak vest
n. 防弹背心
🧩 词语组成解析
flak
[flæk]
n. 高射炮;过分的或抨击性的批评;争吵，敌对;
vest
[vɛst]
n. 马甲;防护衣;内衣;（印有运动员编号的）运动背心;
vi. 合法地被授予;给自己装上教服;
vt. 授权;赋予;穿衣服，穿教服;
vest衣服 → 穿在里面的衣服 → 汗衫，背心，内衣
🗣️ 情景例句
I've got six months to go until graduation.
我还有六个月就毕业了。
This is a bread.
这是一个面包。
and we have to lower into the ground and haul out of the ground great lengths of drill pipe which are rotated by an engine at the top and are fitted with a cutting bit at the bottom.
我们必须把很长的钻杆一节节地钻入地下，然后再从地下拉出来。钻杆顶部安装的发动机带动钻杆旋转，它的底部装有钻头。