现在分组。

Now in groups.

youdao

第一个集合中的每个元素都会出现在分组联接的结果集内，而无论是否在第二个集合中找到相关元素。

Each element of the first collection appears in the result set of a group join regardless of whether correlated elements are found in the second collection.

youdao

group - starting - with方法与group - ending - with类似，但标志节点出现在分组的开始。

The group-starting-with method is very similar to group-ending-with, but the flag node is at the front of the group.

youdao

In terms of sectioning for the undergrads and graduate students here, you'll get an email from Sean Achor tomorrow.

现在先说这里的本科生和研究生,分组问题，你们明天会收到Sean，Achor的邮件。

哈佛公开课 - 幸福课课程节选