2019/7/8
10.发现;偶然遇见____________ 11.与……相连接_______________ 12.以……速度_____________ 13.在……的帮助之下________________ 14.轮流做某事___________________________ 15.出来;出版_________
come across
be connected to
at a speed of
with the help of
take turns to do/doing sth.
come out