“无偿”用英语怎么说

我为你所做的一切都是免费的，无偿的，你明白吗？What I did for you was free, gratis, you understand?他将收藏品无偿捐献出来。He was giving his collection away for nothing.我知道他的帮助不会是无偿的。I knew his help wouldn't be given gratis....

“无偿”的拼音为：wú cháng...