The slow pace of recovery is bad news for more than a million Americans who will stop receiving unemployment benefits after Congress adjourned for the holiday weekend without extending federal aid.
VOA: standard.2010.07.02
One can stop spread of disease through a community without being 100% effective in each person who gets the vaccine.
疫苗能够遏制疾病在整个社区中传播,虽然对于每个人来说它并非百分之百有效
One can stop spread of disease through a community without being 100% effective in each person who gets the vaccine.
疫苗能够遏制疾病在整个社区中传播,虽然对于每个人来说它并非百分之百有效
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