三者都是 “一點也不，絲毫也不”的意思，但是因為 not 後面接的詞不一樣，所以用法也不同：a bit：名詞或形容詞，有點兒，多少，相當。後面可以接名詞或形容詞—— Long Washington experience has made Biden a political realist, if not a bit of a cynic. ——Zbikowski is athletic and aggressive in the ring, if not a bit impatient. ——Not a bit better, not a wee change, not some tinkering at the edges, but a better land full stop. at all：副詞，（否定句）根本；究竟。 ——Often, jurors are won over by an argument immediately or not at all, they say. ——"I am not at all like that, " he says, keen to shake his shady past. ——At the end of the day, ethanol will move over land or not at all. in the least：副詞，一點；絲毫 ——" Countered Henry Tang Ying Yen, one of Tung"s executive councilors: "We are not in the least aiming to curb freedom of assembly. ——The economic outlook in the European Union today is better than one year ago, not in the least as a result of our determined action. ——Not in the least phased by controversy, your vuvuzela product demand has been immune to bans by sports bodies, health risk warnings and invasive noise pollution issues