tract造句

A cold is an infection of the upper respiratory tract.
感冒是上呼吸道的感染。

She produced a feminist tract, "Comments on Birth-Control", in 1930.
她1930年写了篇女性主义的短文《论节育》。

A vast tract of land is ready for development.
一大片广阔的土地可待开发。

• #tract