old - ad. not young or new; having lived or existed for many years
on - prep. above and held up by; touching the upper surface of ("The book is on the table."); supported by ("He is on his feet."); about ("The report on the meeting is ready."); at the time of ("He left on Wednesday.")
once - ad. one time only
only - ad. being the single one or ones; no more than ("We have only two dollars.")
open - v. to start ("They opened talks."); ad. not closed; not secret
operate - v. to do work or a job; to cut into the body for medical reasons
opinion - n. a belief based on one's own ideas and thinking
oppose - v. to be against; to fight against
opposite - ad. different as possible; completely different from; exactly the other way ("North is the opposite direction from south.")
oppress - v. to make others suffer; to control by the use of unjust and cruel force or power
or - conj. giving another of two choices; giving the last of several choices
orbit - v. to travel in space around a planet or other object; n. the path or way an object travels in space around another object or planet
order - v. to give a command; to tell someone what to do; n. a command; the correct or normal way things are organized; a peaceful situation in which people obey laws
发表于 2017-8-6 13:59:00