suggestion作为建议可数吗

　　Her order was phrased as a suggestion.

　　她的命令措辞好像是一项建议。

　　Don't laugh, it's a serious suggestion.

　　别笑，这是一条严肃的建议。

　　He agreed to her suggestion begrudgingly.

　　他不情愿地接受了她的建议。