acylation under low-pressure的用法和样例：
- Sealed under low pressure or a partial vacuum.
- Applications:Suitable for conveying liquefied petroleum gas under low pressur for household daily use.
- There is foreign particle in die cavity and the mold protection under low pressure exceeds the reset time.
- The results indicated that Penglai crude could be processed as ordinary crude after hydro-upgrading under low pressure and high LHSV.
- The liquid drawn off from the bottom of the first fractionating column, the primary fractionating column, is fractionated again in another column under low pressure.