engineer是可数名词吗

　　She is due to deliver a lecture on genetic engineering.

　　根据安排她要作一个关于转基因的`演讲。

　　We subcontracted a small engineering firm to do the work.

　　我们转包给了一家小型工程公司去干那项工作。

　　The bridge is a triumph of modern engineering.

　　这座桥是现代工程的一大成就。

　　How can we tempt young people into engineering?

　　我们怎么才能吸引年轻人学习工程学呢？

　　We subcontracted the work to a small engineering firm.

　　我们把工作转包给了一家小型工程公司。