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
Are you sure?
你确定？
Remember me to your grandmother please.
请替我问候你的祖母。
What is worth doing is worth doing well.
只要你觉得某事值得去做，就一定要把它做好。