绿坝的英文：
Green Dam-Youth Escort

(a filtering software to protect young internet users from pornographic websites)

参考例句：

Green Dam filters words and images as well as web addresses.
绿坝不仅能过滤网络地址，也能过滤文字和图片。

China required all new computers sold domestically to include filtering software, known as Green Dam Youth Escort.
中国要求国内所有新售出的电脑都要安装一款名为“绿坝——花季护航”的过滤软件。

dam是什么意思：
n. 水坝；水闸
v. 筑坝；堵住；压抑；控制

The stream was dammed up.
这溪流被坝堵住了。

The old Aswan dam was a barrage.
老的阿斯旺坝是一个拦河闸。

Saboteurs dynamited the dam.
破坏者炸毁了堤坝。