The relationship between arctic tropopause height and surface air temperature is discussed by using the aerological sounding and surface data during 1977-1990 in Beijing area.
利用北京地区1977—1990年的高空、地面资料,讨论了极地对

与地面温度的关系。
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The supposed importance of influentials derives from a plausible sounding but largely untested theory called the " two step flow of communication" : Information flows from the media to the influentials and from them to everyone else.
人们之所以认为影响者很重要,是源于" 两级传播" 理论。即信息先从媒体流向影响者,然后再从影响者流向其他人。这一理论看似合理,但未经验证。
理选编 But healthcare and consumer industry groups are sounding the alarm, the supply chain could break down as more and more Americans stay home or fall ill, leaving fewer and fewer workers able to make, process, pack and deliver.
但医疗保健和消费行业团体发出了警告,随着越来越多的美国人呆在家里或生病,有能力生产、加
、包装和送货的
人越来越少,供应链可能会因此而崩溃。