意思是：内腔加工，扩孔；上膛；
句子实例：
The heart has four chambers.
心脏有两房两室。
The Senate started on the right fool. In1986, it limited its franking budget to half the total appropriation for both chambers. That seemed fair because the100 senators represent the same total number of constituents as the435 House members.
参院走出了正确的第一步。
1986年把参院的免费邮件预算限制在参众两院该项预算总和的半数。
100位参议员与435位众议员的选民人数一样，所以看来这是公平的做法。
