A new study reveals that the variety of skull shapes among domestic dogs has become just as diverse as the variety between other mammal species, such as bears, weasels, and seals.
Duberstein says when Reagan was first elected in 1980, Republicans urged him to take on a wide variety of domestic issues in the early days of his administration.
他谈到，里根1980年第一次当选的时候，共和党人敦促他在上任之初先着手处理各种各样的国内问题。
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China is aiming to promote domestic consumption through a variety of measures, such as boosting the minimum wage for its workers and building an improved social safety net.