除了日历、树、菜单这类旧备用组件之外，还有一个聊天选项。
In addition to the old standbys like calendars, trees, and menus, each has a charting option.
同样这些站点需要为故障或峰值事件预留一些备用组件，在站点需要附加容量时使用。
Likewise, the site may want to keep components in reserve for failover or peak events when the site might need additional capacity.
包括两个冷却剂系统水泵在内的备用组件都在舱里，安装工作被普遍认为是艰难的，必须进行两次太空行走。
Spare components are on board, including two coolant system pumps, but installation is considered difficult and two spacewalks will be required.
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