If someone acts unilaterally, they do something by themselves, without asking the other side or waiting for the other side to agree. The word is used when a decision touches two or more people, groups, or countries, but only one of them actually made it.

If someone acts unilaterally如果某人 unilaterally 地做事 they do something by themselves他們是自己一個人做的 without asking the other side or waiting for the other side to agree沒有問過對方，也沒有等對方同意。The word is used這個字用在 when a decision touches two or more people, groups, or countries某個決定牽涉到兩個以上的人、團體或國家 but only one of them actually made it卻只有其中一方真正做了決定。

A country can unilaterally leave an agreement; a company can unilaterally change the price in a contract; a government can unilaterally close a border.

A country can unilaterally leave an agreement一個國家可以 unilaterally（單方面）退出協議 a company can unilaterally change the price in a contract一間公司可以單方面更改合約裡的價錢 a government can unilaterally close a border一個政府可以單方面關閉邊境。

This is formal, and it lives mostly in news, politics, law, and business writing — you would not say it to a friend about lunch.

This is formal這是正式的說法 and it lives mostly in news, politics, law, and business writing主要出現在新聞、政治、法律和商業文書裡 you would not say it to a friend about lunch你不會用它來跟朋友討論午餐的事。

It usually carries a small complaint inside it: the person saying it often feels the other side had a right to be asked and was not. So "they changed the terms unilaterally" is not neutral reporting; it is a quiet accusation.

It usually carries a small complaint inside it它通常暗暗帶著一點不滿 the person saying it often feels說這句話的人往往覺得 the other side had a right to be asked and was not對方本來應該被問過，卻沒有被問。So "they changed the terms unilaterally" is not neutral reporting所以「they changed the terms unilaterally（他們單方面更改了條款）」不是中立的陳述 it is a quiet accusation而是一種含蓄的指控。

Sometimes, though, it is simply a description of a legal fact — a "unilateral" contract or a unilateral withdrawal — with no blame attached, and you tell the difference from who is speaking and why.

Sometimes, though不過有時候 it is simply a description of a legal fact它只是單純在描述一個法律事實 a "unilateral" contract or a unilateral withdrawal像是「unilateral」合約，或單方面撤回 with no blame attached並沒有帶著責怪的意思 and you tell the difference from who is speaking and why你要從是誰在說、為什麼說，來分辨這兩種差別。