twice a week 是英语中表示频率的固定搭配，意为“每周两次”。其核心结构由“次数+时间单位”构成，其中 twice 表示“两次”，a week 表示“每周”，中间无需介词连接，整体在句中通常作状语，用于回答 how often（多久一次）引导的问句。

音标

英式发音：/twaɪs ə wiːk/

美式发音：/twaɪs eɪ wik/

用法说明

频率表达核心结构
英语中表示动作频率时，常用“次数+时间单位”结构：

一次：once a week/month/year

两次：twice a week/month/year

三次及以上：基数词+times a week/month/year（如 three times a week）
例如：She practices piano twice a week and violin three times a week.

在句中的位置
通常位于句末，也可置于句中（动词之后）：

句末：I go swimming twice a week.

句中：He twice a week visits his grandparents.（较少见，更自然的表达为 He visits his grandparents twice a week.）

与疑问词搭配
用于回答 how often（多久一次）引导的问句：

— How often do you exercise?

— Twice a week.

短语搭配

常见与动词或名词搭配，表示具体活动的频率：

exercise twice a week 每周锻炼两次

fasting twice a week 每周禁食两次

take English classes twice a week 每周上两次英语课

clean the room twice a week 每周打扫两次房间

例句

We have English classes twice a week.

The villa is cleaned twice a week.

She used to go to the hairdresser twice a week.

They fetched water twice a week from the well at the bottom of the hill.

I mop the kitchen floor twice a week.

The patient attended Tai Chi classes twice a week for 12 weeks.

We played golf at least twice a week last summer.

The program holds tobacco cessation groups twice a week.

He offers us free English lessons twice a week.

The old man visits his grandson twice a week.

例句解析

主动语态：The houseboy comes to mop our kitchen floor twice a week.
（男仆每周两次来拖洗我们的厨房地板。）

被动语态：The villa is cleaned twice a week.
（这栋别墅每周打扫两次。）

疑问句：Do you go to the beauty salon more than twice a week?
（你每周去美容院超过两次吗？）

从日常活动到科学研究，twice a week 都是描述规律性行为的简洁表达。它不仅体现了英语中“次数+时间”的频率逻辑，也反映了语言对生活节奏的精准概括。下次当你需要说明每周固定做两次的事情时，不妨试试这个实用短语——无论是健身、学习还是家务，它都能让你的表达更地道。