B.t.u.
abbr. 英国热量单位（British thermal unit）；英国商务部单位（Board of Trade Unit）
🗣️ 情景例句
I'd like you to meet Audrey and her mother, Mrs. Cooper.
我来向你介绍， Audrey和她母亲 Cooper太太。
She has a particular interest in painting.
她特别爱好绘画。
We can negotiate the unit price for large orders.
如果大量订购，单价可以再谈。