BO is an informal way to say that someone's body smells unpleasant because of sweat. The letters stand for body odour (British spelling) or body odor (American spelling).

BO is an informal way to say that someone's body smells unpleasant because of sweat 是一種口語說法，指某人因為流汗身上有異味。body odour（英式拼法）or body odor（美式拼法）the letters stand for 這兩個字母代表的就是 body odour（英式拼法）或 body odor（美式拼法）

People use it in everyday talk, often with a little embarrassment or a joke: I think I have BO.

in everyday talk 在日常對話裡 people use it 大家會這樣用，often with a little embarrassment or a joke 常常帶點不好意思或開玩笑的語氣：I think I have BO 「我覺得我有 BO」

It is not the word a doctor would write on a chart — they would say body odour, or name a medical problem. BO usually means the sour smell of sweat on skin and clothes after heat or exercise, not perfume and not bad breath.

it is not the word a doctor would write on a chart 這不是醫生會寫在病歷上的用詞 — they would say body odour, or name a medical problem 他們會說 body odour，或直接講出醫學上的問題名稱。the sour smell of sweat on skin and clothes after heat or exercise 熱天或運動後皮膚和衣服上那種酸酸的汗味 BO usually means 通常 BO 指的就是這個，not perfume and not bad breath 不是香水味，也不是口臭

You say the two letters, B-O. It can sound a bit blunt, so people sometimes soften it, but everyone knows what it means.

the two letters, B-O 這兩個字母 B-O you say 要唸出來。it can sound a bit blunt 這樣講可能有點直接，so people sometimes soften it 所以大家有時候會講得委婉一點，but everyone knows what it means 但大家都聽得懂是什麼意思