Mtbf
[计] 平均无故障工作时间, 平均故障间隔时间
🗣️ 情景例句
I'm taking that bus also.
我也是搭那班车的。
He has gone to America.
他去美国了。[动作结束后的结果持续至今]
Just now we all watched you sign to show that you had received the cheque.
刚才我们大家都观察到了你为表明已收到那张支票而签名。