VOA慢速英语:Researchers Find Way to Reduce Methane from Cows

短语讲解：

1. Farm animals are responsible for 44 percent of all human-caused methane, according to the Reuters news service.

according to 根据，按照
例句：Philip stayed at the hotel, according to Mr Hemming
据亨明先生所说，菲利普住在旅馆里。

2. When talking about global warming, many people think of carbon dioxide, another heat-trapping gas.

think of 想起; 考虑
例句：A driver must think of safety.
司机一定要考虑到安全。

3. The researchers found that cows who ate grass mixed with the leucaena leaves belched about 36 percent less methane than a diet of grass alone.

mix with （使） 与…混[结]合; 与（某人）交往
例句：He doesn't mix with the rabble here.
他不与这里的下等人交往。