1c. Using the "Do not participate in Clean" option in library.
在库中使用“Do not participate in Clean”选项。
Note that many users do not participate in this test set at all.
注意,很多用户根本不在测试集中。
We are often afraid of what others would think if we do not participate.
我们总是担心如果我们不参加别人会怎么看。
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