Security of tenure
[经] 使用期保障
🧩 词语组成解析
of
[əv]
prep. 关于;属于…的;由…制成;
aux. 助动词 [非标准用语、方言] =have [主用于虚拟语气];
🗣️ 情景例句
I do his taxes every year.
我每年为他处理税务。
I'm twenty and proud that I've never fed myself!
我二十岁了，但是，以从来不会自己挣钱吃饭为傲。
Once the oxygen content of the air had risen to 25% it was ready to burn.
一旦氧气在空气中的含量达到25%，它就要燃烧。