Know what's what
有常识, 懂事, 有鉴别能力
🧩 词语组成解析
know
[no]
v. 知道;了解;认识;确信;
n. 知情;
what's
[[wɔts]]
（尤当 has 为助动词时, what is 或 what has 的常用口语形式）; 乌
what
[wɑt]
pron. （用以询问某人或某事物的词）什么，多少;…的事物;
adj. …的（事物或人）;
adv. （用于感叹句中）;
int. （用以表示不相信或惊奇）;（用以表示未听清楚对方说的话）;
🗣️ 情景例句
That's not an overstatement. As I said, these are only the main ones. There are many others.
你这样说一点也不夸张，我只是说了几个重要的节日，还有很多没有提及呢。
Money talks.
有钱能讲话。
Even if a piped water supply is safe at its source,
既使管道供水系统在水源处是安全的，