一.两者作为“卫生的”、“有益于健康的”意思是相同的
That book is not healthy reading for a child.
对孩子来说那书不是本健康读物.
healthy country air
有益于健康的农村的空气
Regular exercises are healthful.
经常运动有益于健康.
二.但是healthy还可以作为：
1.健康的、健壮的
The children look very healthy.
孩子们看来很健康.
2.看起来健康的
His cheeks have healthy glow.
他的双颊有着健康的红晕.
3.健全的The country's economy is not very healthy.
该国的经济不很景气.