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wear a seatbelt
表示“系着安全带”的状态，是日常口语常用搭配。
You should always wear a seatbelt when driving.
开车时你应该始终系安全带。
安全带
先理解核心含义，再看它在真实句子里的用法。
安全带
a safety belt in a car or plane that holds you in your seat during an accident
You should always wear a seatbelt when driving.
开车时你应该始终系安全带。
座位安全带
n a safety belt used in a car or plane to hold you in your seat in case of an accident
Please fasten your seatbelt before the plane takes off.
请在飞机起飞前系好安全带。
It is important to wear a seatbelt even on short car journeys.
即使在短暂的汽车行程中，系安全带也很重要。
The driver reminded everyone to buckle their seatbelts.
司机提醒大家系好安全带。
表示“系着安全带”的状态，是日常口语常用搭配。
You should always wear a seatbelt when driving.
开车时你应该始终系安全带。
这是航空和汽车上的标准安全提示语，fasten 强调“系紧”的动作。
Please fasten your seatbelt during the flight.
飞行期间请系好安全带。
被动结构，常用于法律或安全规定，表示强制性要求。
Every passenger is required to wear a seatbelt.
每位乘客都必须系安全带。
Not this
I always wear seatbelt when I drive.
Use this
I always wear a seatbelt when I drive.
安全带是可数名词单数，前面需要加冠词 a；中文没有冠词，所以容易漏掉。
Not this
Please tie your seatbelt before driving.
Use this
Please fasten your seatbelt before driving.
中文的“系”可能对应多个英文动词，但系安全带常用 fasten 或 buckle，tie 一般用于绳子、鞋带等。
Not this
You should wear a seatbelt on the car.
Use this
You should wear a seatbelt in the car.
小汽车是封闭空间，表示“在车里”用 in the car，而 on the car 常指在车顶等位置。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
系好安全带
Please fasten your seatbelt before the plane takes off.
飞机起飞前请系好安全带。
系安全带
In many countries, drivers and passengers must wear a seatbelt.
在许多国家，驾驶员和乘客都必须系安全带。
解开安全带
Please do not unfasten your seatbelt until the plane has come to a complete stop.
飞机完全停稳前，请不要解开安全带。
安全带指示灯
The seatbelt sign is still on, so please remain seated.
安全带指示灯还亮着，请留在座位上。
安全带法规
Many countries have introduced a seatbelt law to reduce road deaths.
许多国家已出台安全带法规以减少道路死亡人数。
做好准备，迎接即将到来的事情（常指激动人心或困难的事）
Fasten your seatbelts: the results of the election will be announced tonight.
系好安全带：今晚将公布选举结果。
出自1950年电影《彗星美人》（All About Eve），常用来提醒人们做好准备迎接动荡或困难的局面。
Fasten your seatbelts, it's going to be a bumpy night!
系好安全带，今晚会颠簸不平！
出自《神奇校车》（The Magic School Bus），芙瑞丝老师每次出发前都会说的经典台词，已成为广为人知的流行语。
Seatbelts, everyone!
大家系好安全带！
Use seatbelt naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
seat（座位）＋belt（带子）：坐进座位就把它系上，保你安全。
语域：neutral 常见场景：驾车安全提示、乘机安全说明 seatbelt 是常用的中性词，多用于日常交流和安全提示中，在正式文件或说明里也比较常见。
与 seatbelt 韵脚相同的词有 belt、felt、melt、dealt、spelt（均读 /-ɛlt/）。注意 seatbelt 中的 seat- 读 /siːt/，与单词 seat 同音，不要按 set 的读音读成 /sɛt/；也不要受 deal 拼写影响，dealt 里的 ea 读 /ɛ/。
Dictionary facts from ECDICT, WIKTIONARY.