这句英语怎么样理解Chinese people have had more time to spend on various kinds of leisure activities.中的现在完成时强调什么?

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• 这句英语怎么样理解Chinese people have had more time to spend on various kinds of leisure activities.中的现在完成时强调什么?
• 这个英语句子怎么理解啊?Scienctists are now trying to make robots look like people and do the same things as us.为什么now 放在are后面啊,读的很不顺.这是人教新目标八年级下书上的.老师没讲这一点,原来没见过这样用now的.
• While warnings are often appropriate and necessary--the dangers of drug interactions,for example--and many are required by state or federal regulations,it isn"t clear that they actually protect the manufacturers and sellers from liability if a customer is injured.