不需要为 lambda 函数提供返回类型；根据返回语句推导出返回类型。
On to the answers. You do not need to provide the return type of a lambda function; it is deduced from the return statement.
根据返回的布尔值，每条记录要么成为结果集的成员，要么被归为不满足搜索条件的记录放弃。
Based on the Boolean return value, the record either becomes a member of the result set or is tossed aside as a record that does not meet the search criteria.
根据警官们的描述，他在那里签署了一份登记表并与他们“愉快地”交谈，然后在宵禁时间返回庄园。
There he signs a register and chats "pleasantly" with the officers, according to their account, and returns to his curfew at the hall.
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