Know one's onions
精明
🧩 词语组成解析
know
[no]
v. 知道;了解;认识;确信;
n. 知情;
a. 人们的；自己的
n. 奥尼恩斯（姓氏）；奥尼恩斯（英国语言学家、词典编纂家）
🗣️ 情景例句
I think you should show it to Mr. Carlson.
我觉得你应该给Carlson先生看看。
What's the basis of your belief that the product is safe?
你凭什么相信产品是安全的？
These friendly dogs, which were first brought from Asia, were used as watchdogs even in Roman times.
那些最先从亚洲引进的狗，待人友好，早在罗马时代就给人当看门狗了。