proficiency
n[U]
~ (in sth/doing sth)being proficient (in sth) 精通; 熟练
a test of proficiency (in English) (英语)水平测试
show proficiency in operating a switchboard 操作配电板十分熟练.
It seems that there is a big waste pipe coming down from the town. Do you see it, over there?
好象有一条很粗的废水管从镇上通到海里。您看见了吗?在那边?
When the ship finally arrived in a port, the wooden cover was opened wide and Kunta could see in daylight for the first time across the part of the ship where he had been chained.