He also makes some initial inquiry into the High availability theory and analysis of the availability of the system in the article.

文中还对高可用系统理论作了初步探讨，对系统可用度进行了分析。

youdao

There is a controversial theory put forward by economist Steven Levitt that the increased availability of legal abortion after the Supreme Court ruling in 1973 on Roe v Wade meant that fewer children were born to young, poor, single mothers.

BBC: US crime figures: Why the drop?