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动词 be easy to; convenient for便于联系 be easy to contact例句1：为了便于沟通，我们大家要学好标准语。 We should learn the standard speech to better communicate.例句2：为了便于青少年学习， 他们编了一套《自然科学小丛书》。They have compiled a collection of Elementary Readings on the Natural Scieces to help young people in their studies.
