They found that all mangrove forests on coastlines are under threat from development, logging or other dangers.

VOA: special.2010.04.20

After logging into the course's website, you'll appear on the top left-hand corner as I just did with your actual names that we know exactly who we're working with and then what you can do is raise your hand sort to speak.

登录课程网站之后，你将被显示在,左上角，通过你们的真实名字,我可以知道我到底是在跟谁一起工作,然后你们可以做的是举手来回答问题。

哈佛公开课 - 计算机科学课程节选

And developers,logging companies, and strip-mine operators on the edge of the swamp can easily upset the delicate balance of nature in the area.

VOA: standard.2010.03.29

Illegal logging is down in part because export countries are cracking down on the problem.

VOA: standard.2010.07.28

A new report says more than 17 million hectares of forest have been saved in recent years because of a major clampdown on illegal logging.

VOA: standard.2010.07.28