生疏shēng shū
unfamiliar, strange, out of practice生育shēng yù
to bear, to give birth, to grow生锈shēng xiù
to rust, to grow rusty, to corrode用功yòng gōng
diligent, industrious (in one's studies)用户yòng hù
user, consumer, subscriber, customer甭béng
need not, (contraction of 不 and 用)田径tián jìng
track and field (athletics)申报shēn bào
to report (to the authorities)电源diàn yuán
electric power source