Tightened
v. 收紧( tighten的过去式和过去分词 ); （使）变紧; （使）绷紧; 加紧
🗣️ 情景例句
That sounds fine.
这样听起来蛮好的。
Virtue is a jewel of great price.
美德是无价之宝。
Then knowledge began to be accumulated according to a systematic plan.
于是，知识便开始有系统有计划地积累起来。