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1·She doesn't know diddly about it.

她根本不知道这事儿。《牛津词典》

2·A good vacuuming will get up the sand and other loose debris from your car's carpeting, but it won't do diddly for stains or ground-in dirt.

用真空吸尘器好好打扫的话可以把沙土和其他一些碎屑吸出来，但它对染色和污垢就毫无办法了。

3·Second, the columnist must know whereof he speaks, and though I can't recall his words, I can reduce them to one thought: You don't know diddly .

第二，专栏作家必须知道他在说什么，虽然我不能完全回忆起他说的话，但能总结为一点：你完全不知道。