?沼气报警铃
沼气报警铃
The methane gets converted to electricity and a family in an emerging nation can charge a phone, or other device, for free.
FORBES: Why Are Portable Fuel Cells Such A Flop?
英汉双解词典包含3185865条英汉词条，基本涵盖了全部常用单词的翻译及用法，是英语学习的有利工具。