Explains
v. 解释；说明（explain的三单形式）
🗣️ 情景例句
If you know a man's last name, address him as 'Mr.'.
如果你知道一个男性的姓， 应该用 'Mr。' 来称呼他。
It's a worthwhile cause.
这是值得为之奋斗的事业。
Our next obstacle was a shallow pool of water about half a mile across.
下一个障碍是一片约半英里宽的浅水塘。