"That's" is a contraction of "that is" and is a completely formal form. It is appropriate to use in formal writing or speech.
that's完全形式
"That's" 是 "that is" 或 "that has" 的缩写,因此完全形式可以是:
- "That is",表示 "那就是"、"那是" 的意思。
- "That has",表示 "那已经"、"那曾经" 的意思。
例如:
- That's a good idea.(那是个好主意。)
- That's been a problem for a long time.(那已经成为问题很长时间了。)
需要根据上下文来判断 "That's" 的具体含义。