medium

I ordered a medium coffee, but the waiter accidentally brought me a large one.

(Chinese) 我点了一杯中杯咖啡，但服务生不小心给我拿了个大杯。

The steak was cooked to a perfect medium, so the center was still slightly pink.

(Chinese) 牛排烤到了完美的中等熟度（五分熟），所以中心仍然微红。

The Internet has become the most popular medium for news and entertainment today.

(Chinese) 互联网已成为当今最受欢迎的新闻和娱乐媒介。

Air is the medium through which sound waves travel to our ears.

(Chinese) 空气是声波传到我们耳朵里的媒介。