Stone cage net protective structure is in itself under the action of gravity for the installation.

石笼网防护结构是在其本身重力的作用下进行安装的。

youdao

Gravity ball check valves are converted to vent valves by replacing the standard ball with a floater ball and inverting the valve at installation-with seat up.

重力球形止回阀可以变为通风阀，只需用漂浮球体更换标准球体，然后在安装时将阀门倒置，使其阀座向上即可。

youdao

The novel toy is simple durable, having easy installation. The wing position and a model gravity center can be adjusted to obtain more perfect flying state.

本新型玩具简单耐用，易于安装，并且可调节机翼位置及模型重心，以获得更完美的飞行状态。

youdao