随着天然气逐步进入家庭，如何提高城市天然气的使用效率成为当今一项重要的课题。
The natural gas is gradually coming into families. Nowadays how to improve the use efficiency of natural gas becomes an important project.
随着天然气逐步进入家庭，如何提高城市天然气的使用效率成为当今一项重要的课题。
The natural gas is gradually coming into families. Nowadays how to improve the use efficiency of natural gas becomes an important project.
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