“平静的”用英语怎么说？

她叹了口气，然后继续用温柔、平静的声音说下去。She sighed, then continued in a soft, calm voice.他穿着简朴，过着平静的家庭生活。He dressed simply and led a quiet family life.他看着船边平静的水。He watched the still water over the side of the boat....