Subscribe expression，这个表达式允许里程碑订阅或接收它感兴趣的输入事件。
Subscribe expression, which is the expression that allows the milestone to subscribe to receive the input events it is interested in.
输入您的每日体重，设置里程碑和跟踪在一个地方你的体重全部损失。
Enter your daily weight, set milestones and track your weight loss all in one place.
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