The collapse is similar to what happens to hardenedglass when it is smashed with a hammer, he said.
他认为，这次破裂类似于用锤子击打硬化玻璃的情形。
2
Door window should be made out of hardenedglass in order to protect worker in case of leakage and broken valve.
观察门上需安装有钢化玻璃，保护操作者，防止被测地泄漏和破裂。
3
Activated by sodium glass, chemically bonded ceramics were produced with water-hardened slag grains from blast furnace, and the strength grade could be the same as grade 52.5 cement.