Creating the main activity 创建应用的主页面
activity main program 活动主程序
main fault activity 主要断裂活动
Main Economic Activity 主要经济活动
commercial activity main body 商业活动主体
main digestive enzyme activity 主要消化酶活性
Even though training is not our main activity we will continue with it.
即使培训并非我们的主要工作，我们也要持续开展。
May ask questions or just talk to other children, but the main activity is simply to watch.
他们可能会提问或者和其他孩子说话，但是主要的活动就是看。
Within each activity, a second row of tabs might also display, reflecting multiple functions or steps within one main activity.
对于每个活动，还可能会显示二级选项卡行，反映一个主活动中存在多个功能或步骤。
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