beneficial /ˌbɛnəˈfɪʃəl/ adjective Learner's definition of BENEFICIAL
[more beneficial; most beneficial]
: producing good or helpful results or effects : producing benefits有益的；有帮助的；有利的 -
He hopes the new drug will prove beneficial to/for many people.他希望新药将有益于众人。
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Regular exercise has many beneficial health effects.经常锻炼有益健康。
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They have a relationship that is beneficial to/for both of them.他们保持着一种互惠互利的关系。
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Some insects are harmful but others are beneficial.有些昆虫是害虫，而有些则是益虫。