1、With the American market hardly booming, a third class of firms has rushed to expand globally.
因美國市場幾難擴展，一些三類律所也向全球市場奔去。

2、The third class is for ideas that are impossible because they violate the laws of physics.
第三類是那些違反物理定律的想法，因而不可能實現(xiàn)。

3、The P&G uses third class to mail free samples of soap.
P&G公司以三類郵件寄出免費肥皂樣品。

4、The personnel of the third class have not trained the professional knowledge yet.
第三班的人員還沒有進行專業(yè)知識培訓。