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作为附注，顺便说句题外话，和by the way意思相近，例句
As a side note, there is no equivalent to tapply in the plyr package.
各种/各类/所有的，例句
In order to improve all the mechanism, we‘ are looking across the range of all the platforms and areas.
注意力集中于(某事)，聚焦于，对准（使(枪炮)瞄准(某目标)）：，例句：
# When we had all zeroed in our guns on the enemy post, we opened fire.
# The plane zeroed in on the arms factory and distroyed it with one bomb.
1）switch hitters
左右手均能击球的运动员！例句
As you can see, the proportion of switch hitters (bats=="B") increases with higher batting average(击球率)
马赛克图/拼花图
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原文地址：http://www.cnblogs.com/Bfrican/p/4431691.html
