Breechblock
n. 炮闩, 闩体, 尾栓
🗣️ 情景例句
Come on in, Dad.
请进来 ，爸爸。
Most of them are less than 30.
他们中大多数不到30岁。
At a special swimming pool in Los Angeles, children become expert at holding their breath under water even before they can walk.
在洛杉矶的一个特设的游泳池里，孩子们甚至在还没有学会走路时就已经能熟练地在水下屏住呼吸了。