要下载库包，Composer首先需要知道在哪里可以找到这些软件包。
2.appear to 似乎
例句:On Capitol Hill, senators today appear to view the matter as something of a tempest in a teapot.
美国国会的参议员们今天似乎把这个问题小题大做了。
3.as well as 以及
例句:There are one-room flats as well as two-room flats.
有一室一套的，也有两室一套的。
4.refuse to 拒绝
例句:Local authorities are likely to refuse to hire facilities to unrecognised martial arts organisations.
当地的主管机构可能会拒绝向非官方的武术组织出租设备。
