The object push profile defines the roles of push server and push client.
对象推送配置文件定义了推送服务端与客户端的角色。
Push down on your tongue with the flat object, while, at the same time, you push up with your tongue.
把平物按在你的舌头上，同时向上抬起你的舌头。
An object floats when the upward push is greater than its weight.
当这个向上的作用力比物体本身的重量大时，物体就会漂浮。
An object floats when the upward push is greater than its weight.
当这个向上的作用力比物体本身的重量大时，物体就会漂浮。
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