研究人员播放一种声音，然后隔一段时间(每组的时间长短不同)，向老鼠的眼睛内吹一阵气，令它们眨眼睛。
The researchers played a sound and then, after a set period of time that varied between each group, blew a puff of air into the rats' eyes, making them blink.
世界其他地区则得在购买液化天然气与通过管道进口天然气之间做出选择，而与俄罗斯的关系则已使后一种前景令某些国家感到苦恼。
The rest of the world would either buy liquefied natural gas (LNG) or get gas in pipelines, a prospect that relations with Russia have made irksome to some.
在席卷美国和加拿大的页岩气勘探和生产热潮令两国国内天然气价格下跌之后，美加两国的企业正在寻求出口天然气的机会。
U. S. and Canadian companies are exploring opportunities for exporting natural gas after a boom in shale-gas exploration and production across the U. S. and Canada deflated domestic prices.
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