＂全是＂是什么意思?
操场上全是锻拣的人。
"全是＂是什么意思?

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are teeming with

It means the place is full of ..

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全是有两 个意思，一，人很多；二，人人都是做相同的事情（锻拣）

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有两种可能：
1. 操场上很多人在锻炼，没有多余的地方了。（有点夸张，是为了强调人多。）
2. 操场上的人所做的事情相同——都是锻炼，没有人在做别的事情。（例如晒太阳、盖房子、扫地、随地大小便。）

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“All” can be used to express it.

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i think it is a item which the author want to express his feelings, he exaggerate the truth, in fact, there may be some people, or many people.