/bu:n; bun/
n
1 (dated 旧) request or favour (used esp with the vs shown) 请求, 恩惠（尤与下列动词连用）
*ask a boon of sb 请求某人赐惠
* grant a boon 施恩.
2 thing that one is thankful for; benefit; advantage 所感激的事; 好处; 利益
*Parks are a great boon to people in big cities. 在大城市里, 公园是人们的好去处.
* A warm coat is a real boon in cold weather. 寒衣在天冷时是至宝.

/bu:n; bun/
adj (idm 习语) a boon companion cheerful friend with whom one enjoys spending time 好友
*Bill and Bob are boon companions. 比尔和鲍勃是很合得来的朋友.

n [C usually singular]
[Date: 1100-1200; Language: Old Norse;Origin:'prayer, request']
something that is very useful and makes your life a lot easier or better
　The bus service is a real boon to people in the village.