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一穷二白

繁体：一窮二白

yi1 qiong2 er4 bai2

• impoverished
• backward both economically and culturally

一窥端倪

繁体：一窺端倪

yi1 kui1 duan1 ni2

• to infer easily; to guess at a glance; to get a clue

一窍不通

繁体：一竅不通

yi1 qiao4 bu4 tong1

• lit. doesn't (even) enter a single aperture (of one's head)
• I don't understand a word (idiom)
• it's all Greek to me

一站式

yi1 zhan4 shi4

• one-stop (service, shop etc)

一笑了之

yi1 xiao4 liao3 zhi1

• to laugh away (instead of taking seriously)

一笑置之

yi1 xiao4 zhi4 zhi1

• to dismiss with a laugh
• to make light of

一笔不苟

繁体：一筆不苟

yi1 bi3 bu4 gou3

• lit. not even one stroke is negligent (idiom)
• fig. to write characters (calligraphy) in which every stroke is placed perfectly

一笔勾销

繁体：一筆勾銷

yi1 bi3 gou1 xiao1

• to write off at one stroke