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at mealtime(s)
mealtime 前常用介词 at；at mealtime 指某一个固定进餐时段，复数 at mealtimes 则泛指多个进餐时段。
Turn off your phone at mealtimes.
请在进餐时间关掉手机。
进餐时间；用餐时间
先理解核心含义，再看它在真实句子里的用法。
进餐时间；用餐时间
the time at which a meal is customarily eaten
Turn off your phone at mealtimes.
请在进餐时间关掉手机。
规定的用餐时间
The appointed time at which a meal is served or eaten.
Please turn off the television at mealtime so we can talk.
进餐时间请关掉电视，这样我们才可以聊天。
The cafeteria gets very crowded at mealtimes, so we usually go early.
餐厅在用餐时间非常拥挤，所以我们通常早点去。
Try to avoid heavy snacks close to mealtime if you want to enjoy your dinner.
如果你想好好吃晚餐，尽量别在临近用餐时间吃太多零食。
mealtime 前常用介词 at；at mealtime 指某一个固定进餐时段，复数 at mealtimes 则泛指多个进餐时段。
Turn off your phone at mealtimes.
请在进餐时间关掉手机。
mealtime 可放在名词前作定语，常见搭配如 mealtime routine（进餐时间安排）、mealtime rituals（进餐习惯）。
A regular mealtime routine helps children eat better.
固定的进餐时间安排有助于孩子更好地吃饭。
it is mealtime 常用于口语，表示“到进餐时间了”，后面常用 so/let's 引出建议。
It's mealtime, so let's sit down and eat.
到吃饭时间了，我们坐下来吃吧。
Not this
We should not talk in mealtime.
Use this
We should not talk at mealtime.
mealtime 表示“进餐时间”这个时间点，英语中表示“在某个时间点/时刻”用介词 at，不用 in；in 通常用于较长的时段（如 in the morning）。所以改为 at mealtime 才是“在用餐时间”的正确搭配。
Not this
I eat three mealtimes a day.
Use this
I eat three meals a day.
mealtime 的意思是“进餐时间”，不是“一餐饭”。“一日三餐”应说 three meals，若说 three mealtimes 就会变成“三个进餐时间”，语义错误。
Not this
At the mealtime, we should wash our hands.
Use this
At mealtime, we should wash our hands.
泛指“用餐时间”这一习惯性时间时，mealtime 前不加 the；加 the 会变成特指某一次进餐时间。零冠词 at mealtime 才是表示“在用餐时间（一般情况）”的惯用搭配。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
在用餐时间
The whole family gathers at mealtimes.
全家人会在用餐时间聚在一起。
规律的进餐时间
Try to eat at regular mealtimes to keep your energy steady.
尽量在规律的进餐时间吃饭，以保持精力稳定。
家庭用餐时间
Family mealtime is a good chance to talk about the day.
家庭用餐时间是聊聊一天经历的好机会。
进餐惯例
A set mealtime routine helps children feel secure.
固定的进餐惯例能让孩子感到安心。
用餐时的交谈
Mealtime conversation should be relaxed and enjoyable.
用餐时的交谈应该轻松愉快。
临近进餐时间
Snacking around mealtimes can spoil your appetite.
临近进餐时间吃零食会影响食欲。
Use mealtime naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想：meal（饭）+ time（时间）＝开饭的时刻，想象时钟指向饭点。
语域：neutral 常见场景：日常对话、学校或工作安排、健康或育儿类文本 mealtime 是中性常用词，日常口语和书面语中都常见；多用于指习惯性的进餐时间，常搭配 at mealtime 或 during mealtimes，注意其为可数名词，复数形式为 mealtimes。
mealtime 指按习惯进餐的时间点，不指‘吃饭’这一动作。
Dictionary facts from ECDICT, WIKTIONARY.