For this you need to know the named context of the entry being updated.
要做到这一点，则需要知道已更新条目的命名上下文。
2
Get the named context: Updating an existing entry means you want to write your updated data to the same named context on which it was previously written.
获得命名上下文：更新现有条目，这意味着您想把已更新的数据写入它以前所在的命名上下文中。
3
Listing 1 first obtains a reference to the named spreadsheet entry and then obtains that entry's worksheet feed.