helpfulness
n. 有益；有助
例句
His helpfulness today has made me revise my original impression of him.
他今天所表现出的乐于助人的品质使我改变了对他的最初印象。
As children grow older, they become more selective in their helpfulness.
随着孩子年龄的增长，他们变得更有选择性地乐于助人。
Do you cultivate their habits of courtesy, co-opration, and helpfulness naturally?
你们培养孩子的礼貌、合作和互助的习惯吗？
