英语语法分析

The Al-si Alloy modified by tellurium is an ideal material for making high gastight castings.

经碲变质处理的铝硅合金是制造高气密性铸件的理想材料。

After a new installation or maintenance for hydrogen system, pressure test, flushing and gastight test must be done.

新安装或大修后的氢气系统必须做耐压试验、清洗和气密性试验，符合有关的检验要求，才能投入使用。

Recirculation fumigation equipment was used to ventilation after the warehouse was rebuilt in gastight and heat insulated.

将仓房进行气密和隔热改造后，利用环流熏蒸设备，进行环流通风。