循环遍历提要中的条目来构建第一级活动节点。
Iterate through the entries of the feed to construct first-level activity nodes.
清单1获取活动的列表并构建第一级节点。
Listing 1 gets the list of activities and builds the first-level nodes.
为了获取每个活动中的文件，使用TreeParent对象中的另一个方法获取活动(第一级节点)的URL，并对活动url执行一个GET请求，见清单3。
For retrieving the files in each activity, use another method in the TreeParent object to get the URL of the activity (first-level node) and do a get request on the activity URL as shown in listing 3.
实时跟踪让市场人员能够在游戏和整个活动中进行调解，比如说很多玩家会在第一级别卡住，这就带来了一种信号，需要降低难度，让人更容易进入下一关。
Too many players stuck on level one for instance , can be a signal to ease the difficulty level and open the flow into more of the game.
实时跟踪让市场人员能够在游戏和整个活动中进行调解，比如说很多玩家会在第一级别卡住，这就带来了一种信号，需要降低难度，让人更容易进入下一关。
Too many players stuck on level one for instance , can be a signal to ease the difficulty level and open the flow into more of the game.
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