Pleasant.Pleased.Pleasing.Pleasure 这几个词的用法差别及意思有哪些不同?

Pleasant.Pleased.Pleasing.Pleasure 这几个词的用法差别及意思有哪些不同? pleased,pleasure,pleasant,piease,pleasing的区别和用法? pleased pleasing pleasant 的用法 明天有用!pleasant\pleasure\pleased\piease\pleasing\这几个有什么区别,尽量说的 pleasant /pleasure/pleased/pleasing区别 pleasant,pleased,pleasing的用法区别是什么 pleased,pleasant 和pleasure的用法 pleased/pleasing/pleasant的区别 It's a ____(pleasing/pleased\pleasant\pleasure) pleasant和pleased和pleasure和pleasing区别 pleasant\pleased\pleasing的区别（全部） pleased,pleasure,pleasant 三者的分别和用法