Mainframes
n. （大型电脑的）主机, 中央处理机（mainframe的复数形式）
🗣️ 情景例句
Hey, Xiao Li, are you doing anything this weekend?
嘿，小李，这个周末有没有什么事要做？
Is this yours?
这是你的吗？
it is extremely difficult to estimate the true value of the services which people perform for us.
但要估算别人为我们为所提供的服务的价值却是极其困难的。