around 9 a.m. 和 about 3.30 p.m.前面可以加介词at吗

问题描述

请问下面句子中的 around 9 a.m. 和 about 3.30 p.m.前面可以加介词at吗？

I was very happy with the school hours in  Britain  because school starts around 9 a.m. and ends about 3.30 p.m. 我很喜欢英国中学的作息时间，因为学校每天上午大约9点上课，下午大约3点半放学。

句子来源：高中英语译林版教材第1单元（Unit 1）

老师答疑

黎老师：

在表示“大约......”的时间状语 around / round / about / round about / around about... 的前面，用或者不用介词 at 都是正确的。例如：

(1) We left around / about 8 o'clock. 我们在8点钟左右离开了。（《牛津高阶英汉双解词典》第8版p.93）

(2) We're leaving round about ten. 我们十点钟左右要离开。（《牛津高阶英汉双解词典》第8版p.1800）

(3) He arrived (at) about ten. 他是十点钟左右到的。（《牛津高阶英汉双解词典》第8版p.4）

(4) Most guests started to make their way home around about ten o'clock.大多数客人10点钟左右开始回家了。（《朗文当代高级英语辞典》第5版）

(5) We left the restaurant at round about 10.30. 我们10点半左右离开了餐厅。（《朗文当代高级英语辞典》第5版）

蒋老师：

可以上加个介词 at，但也可以省略。

正：I was very happy with the school hours in Britain because school starts around 9 a.m. and ends about 3.30 p.m.

正：I was very happy with the school hours in Britain because school starts at around 9 a.m. and ends at about 3.30 p.m.