a helmet for + n./doing sth
表示头盔的用途，for 后接名词或动名词。
She bought a helmet for cycling.
她买了一个骑自行车用的头盔。
头盔；安全帽；防护帽
helmets — plural of helmet
头盔状物；头盔；防护帽。；保护头部的盔甲片；头盔状物。；坚硬材料制成的防护头盔
a hard protective head covering, often part of armour or safety equipment
头盔；防护帽。
A hard, protective head covering, typically part of armour.
保护头部的盔甲片
armor plate that protects the head
头盔状物。
That which resembles a helmet in form, position, etc.
坚硬材料制成的防护头盔
a protective headgear made of hard material to resist blows
Before riding his motorcycle, Tom always puts on his helmet.
骑摩托车前，汤姆总是戴上头盔。
用法提示：helmet 作名词，指保护头部的头盔。
Workers on the construction site must wear a hard helmet at all times.
建筑工地上的工人必须始终佩戴安全帽。
用法提示：helmet 作名词，表示建筑工地用的防护头盔。
She bought a new bicycle helmet with bright lights for night riding.
她买了一个带亮灯的新自行车头盔，用于夜间骑行。
用法提示：helmet 作名词，指自行车运动用的防护帽。
表示头盔的用途，for 后接名词或动名词。
She bought a helmet for cycling.
她买了一个骑自行车用的头盔。
表示未佩戴头盔，常与骑车、滑板等动作连用。
He was fined for riding without a helmet.
他因不戴头盔骑车而被罚款。
宾语是名词时，可放在 on 之后，也可放在 put 与 on 之间：put on your helmet = put your helmet on。
Put on your helmet before you ride.
骑车前先戴上你的头盔。
"in + 冠词 + helmet" 用来描述某人戴着头盔的样子。
The man in the blue helmet is my coach.
那个戴蓝色头盔的男人是我的教练。
grammar · medium
易错句子He always wears helmet when he rides his bike.
正确表达He always wears a helmet when he rides his bike.
helmet 是可数名词，单数形式前必须加冠词或其他限定词；汉语没有冠词，学习者容易漏掉 a/the。这里泛指一顶头盔，用不定冠词 a。
grammar · medium
易错句子There are five helmet in the box.
正确表达There are five helmets in the box.
数词 five 修饰可数名词时，名词要用复数形式 helmets；汉语名词本身没有单复数变化，所以容易忘记加 -s。
grammar · medium
易错句子He put the helmet in his head.
正确表达He put the helmet on his head.
头盔戴在头'上'，英语用介词 on 表示接触并支撑，而不是 in；汉语'头上'的'上'容易被直译成 in。on one's head 是固定搭配。
戴头盔
You should always wear a helmet when you ride a bike.
骑自行车时你应该始终戴头盔。
安全帽
Construction workers must wear safety helmets on the site.
建筑工人必须在工地上戴安全帽。
防撞头盔
Motorcyclists should wear a crash helmet to protect their heads.
摩托车手应该戴防撞头盔来保护头部。
自行车头盔
A bicycle helmet can reduce the risk of head injury.
自行车头盔可以降低头部受伤的风险。
摩托车头盔
He bought a new motorcycle helmet before his trip.
旅行前他买了一个新的摩托车头盔。
Choose the next layer that will help you use helmets with more confidence.
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戴上头盔
Always put on a helmet before riding a motorcycle.
骑摩托车前一定要戴上头盔。