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1.on average 平均
例句：It is higher, on average, in some places than in others.
有些地方的平均智力水平比其它地方更高。
2.physical activity 体育活动
例句："Although physical activity is thought of as an energy-deficit activity," they wrote, "our estimates do not support this hypothesis.
“虽然身体活动被认为是一个能源缺乏的活动的，”他们写道，“我们的估计不支持这个假设。”
3.tennis player 网球选手
例句：The young tennis player will never be able to fling off the experienced competitors.
这个年轻的网球选手绝对不可能打败那些经验丰富的对手。
4.likely to 可能
例句：If you gallop through your work, you are more likely to make mistakes.
如果你匆匆完成你的工作，你就更可能出错了。
