1. In addition; also:
2. More than enough; excessively:
She worries too much.
3. To a regrettable degree:
My error was all too apparent.
4. Very; extremely; immensely:
He's only too willing to be of service.
5. Informal Indeed; so:
You will too do it!
6. Middle English to
7. from Old English t? [to, furthermore] * see de-
源自 古英语 t? [向，更加] *参见 de-
8. A number of commentators have objected to the use of not too as an equivalent of “not very,” as in She was not too pleased with the results. In many contexts this construction is entirely idiomatic and should pass without notice:
很多评论家反对把not too 作为与“not very”等同的词使用， 例如在句子她对结果不是很满意 中。 在许多情况下，这种结构被认为是习惯用法，不为人们注意就通过了：
It wasn't too long ago that deregulation was being hailed as the savior of the savings and loan industry.
It was not too bright of them to build in an area where rock slides occur.
9. In these cases not too adds a note of ironic understatement. · Negation of too by can't may sometimes lead to ambiguities, as in You can't check your child's temperature too often, which may mean either that the temperature should be checked only occasionally or that it should be checked as frequently as possible. · Too meaning “in addition” or “also” is sometimes used to introduce a sentence:
在这些情况下，not too 给句子加上了一个带讽刺意味的语气。 too 与 can't 一起用作否定时，有时会产生歧义， 例如在You can't check your child's temperature too often 这句话中， 可能意为“你只能偶尔给你孩子量量体温”或“你应该经常给你孩子量体温”。too 意为“另外”或“也，又”时， 有时可以用来引导一个句子：
There has been a cutback in federal subsidies. Too, rates have been increasing.
10. This usage cannot be called incorrect, but some critics consider it awkward.