Circular concrete footings formed the support for the hollow columns, which also feature lights inside.
环形的混凝土基座形成了中空柱子的支撑体，中空柱子内部使用了照明装饰。
Easy preparation and production, the hollow glass microspheres can be well mixed by a simple low-speed mixer. Its product has a feature of I ight weight and large volume.
容易制备生产，利用简单低速混合机就可很好地混合空心玻璃微球，成品重量轻、相对体积大。
The encoders feature a hollow shaft diameter up to 10 mm, with the device itself measuring only 36 mm in diameter.
该编码器具有一个直径10毫米的空心轴，设备本身的直径只能测量36毫米。
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