engineer是可數名詞嗎

She is due to deliver a lecture on genetic engineering.

根據安排她要作一個關於轉基因的`演講。

We subcontracted a small engineering firm to do the work.

我們轉包給了一家小型工程公司去幹那項工作。

The bridge is a triumph of modern engineering.

這座橋是現代工程的一大成就。

How can we tempt young people into engineering?

我們怎麼才能吸引年輕人學習工程學呢?

We subcontracted the work to a small engineering firm.

我們把工作轉包給了一家小型工程公司。