上学期，我参加了地理小组的研究性学习。我们研究的课题是：环境污染与环境保护。
Last term I took part in a geography research study group. Our topic was environmental pollution and protection.
本发明生成的保护气体具有使用方便、环境污染小的特点，其应用条件与现有技术相同。
The shielding gas of the invention is characterized by convenient application and small environmental pollution and has an application condition the same as that of the prior art.
这一工程的出现有效地解决环境破坏、环境污染等环境危机就要合理地进行环境的管理与保护，制定一套行之有效的措施。
To effectively solve the environmental damage, environmental pollution and other environmental crisis in order to reasonably environmental management, establish a set of effective measures.
这一工程的出现有效地解决环境破坏、环境污染等环境危机就要合理地进行环境的管理与保护，制定一套行之有效的措施。
To effectively solve the environmental damage, environmental pollution and other environmental crisis in order to reasonably environmental management, establish a set of effective measures.
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