o'clock/ə'klɒk $ ə'klɑːk/

ad. used to mean an exact hour

ad. …点钟：I go to school at 7 o'clock. 我7点钟去上学。

◇It's four o'clock in the afternoon. (= It's four p.m.) 现在是下午4点。

音组-ock/-ɒk $ -ɑːk/

block; clock; lock; o'clock; rock

用法o'clock只与整点连用，不能与a.m.或p.m.连用。参见a.m.。