一生
all one's life; throughout one's life
一声
first tone in Mandarin (high level tone)
医生
doctor; CL:個|个[ge4],位[wei4],名[ming2]
一生一世
a whole lifetime (idiom); all my life
一声不响
to keep totally silent; noiselessly
姨甥男女
wife's sister's children
科学技术是第一生产力
Science and technology is the number one productive force (from 1978 speech by Deng Xiaoping 鄧小平|邓小平 introducing the Four Modernizations 四個現代化|四个现代化).