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。