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1·Please move the manhole cover away.

请将人孔盖移开。

2·Why are manhole cover round in shape?

点解下水道的盖是圆形的？

3·If we could get that manhole cover up …

要是我们能把那个下水道入口盖打开…

4·The manhole cover is too weight to move.

人孔盖太沉移不动。

5·The manhole cover is too weighty to move.

人孔盖在重移不动。

6·Cast iron manhole cover anti impact resistance, easy rupture.

铸铁检查井盖不耐冲击，易破裂。

7·In theory, ductile iron manhole cover when installed, should be a whole.

在理论上说，球墨铸铁井盖在安装的时候，应该是一个整体。

8·Cast iron manhole cover of good quality is to see its toughness and hardness.

质量好的铸铁井盖是要看其韧度和硬度的。

9·At the same time, the manhole cover has the characteristics of insulation, noise free.

同时，这种井盖还具有绝缘、无噪声的特点。

10·The manhole cover can be traced back to the Rome times, when the cover is made of stone.

井盖最早可追溯至罗马时代，当时的井盖是用石头做成的。

井盖

1·This kind of resin composite manhole cover with glass fiber and resin as the basic material, curing agent, accelerator as auxiliary material.

这种树脂复合型井盖以玻璃纤维和树脂为基本材料，以固化剂、促进剂等为辅助材料制成。

2·Is mainly the size effect and solidification, shrinkage, stress and other issues clearly, to avoid or reduce the segregation, iron manhole cover deformation and crack defects.

主要是明显的尺寸效应和凝固、收缩、应力等问题，避免或减少铸铁井盖的成分偏析、变形、开裂等缺陷的产生。

3·But need to note is a hardness up, its toughness is to catch up, this can be a good iron manhole cover.

但需要注意一点就是硬度跟上了，其韧性也要跟上，这样才能算是好的铸铁井盖。

4·Resin composite manhole cover is made of polymer composite materials, no recovery value.

树脂复合井盖是由高分子复合材料制成，没有任何回收价值。

5·The main cast iron manhole cover is being applied in the sewers of the city, but the cause of quality problems in what factors?

铸铁井盖主要是被应用在城市下水道中，但造成其质量问题的因素在哪些？