U1 When was it invented?
。。。的样式
the style of
被用于做。。。(2个)
be used for doing/be used to do
思考;考虑(2个)
think of/think about
在我们的日常生活中
in our daily lives
偶然;意外
by accident
落入;陷入
fall into
发生;出现
take place
。。。的流行
the popularity of
似乎;好像
seem to do sth.
把。。。翻译成。。。
translate...into
少于
less than
毫无疑问
without doubt
突然
all of a sudden
建议某人做某事(2个)
advise sb. to do sth./suggest sb. to do sth.
如此。。。以至于(2个)
so...that.../such...that...
带回来
bring back
最。。。之一
one of the +最高级+名词复数
习惯做某事
be used t