a repellant against sth
against 后面接需要驱赶的对象，如昆虫、动物。
Use a repellant against mosquitoes when you go hiking.
徒步时要用驱蚊剂。
驱避剂；驱虫剂
repellants — plural of repellant
防水剂；拒水剂；排斥力；击退力；用于防水处理织物的化合物；驱赶动物的化学物质；排斥的力量
a chemical substance that keeps insects or other animals away
用于防水处理织物的化合物
a compound with which fabrics are treated to repel water
驱赶动物的化学物质
a chemical substance that repels animals
排斥的力量
the power to repel
I bought a spray-on water repellant for my jacket at the outdoor store.
我在户外用品店给夹克买了一种喷雾式防水剂。
用法提示：名词，指防水剂，作为宾语出现。
These natural mosquito repellants are safer for the environment than chemical ones.
这些天然驱蚊剂比化学驱蚊剂对环境更安全。
用法提示：名词复数，指多种驱虫剂，作主语。
The new fabric repellant keeps dirt and stains from sticking.
这种新型织物驱污剂能防止污垢和污渍附着。
用法提示：名词，指驱污剂，作主语。
against 后面接需要驱赶的对象，如昆虫、动物。
Use a repellant against mosquitoes when you go hiking.
徒步时要用驱蚊剂。
常用 act as a repellant to sth 表示“对某物有驱避作用”。
The bitter taste acts as a repellant to most insects.
这种苦味对大多数昆虫起到驱避作用。
此用法中 repellant 指用于织物防水的整理剂。
The fabric is treated with a repellant so that water runs off.
这种布料经过拒水剂处理，水会直接流走。
grammar · medium
易错句子We bought a mosquitoes repellant for the trip.
正确表达We bought a mosquito repellant for the trip.
英语中名词作定语修饰另一名词时通常用单数，即使它指很多蚊子：mosquito repellant。这里把修饰语改成单数 mosquito 即可，不能因为蚊子多就用复数 mosquitoes。
grammar · medium
易错句子This lotion is used to repellant mosquitoes.
正确表达This lotion is used as a repellant against mosquitoes.
repellant 在本义中是名词，不是动词；used to 后要么接动词 repel，要么保留名词并用 as a repellant 表示“作为驱避剂”。改为 as a repellant against 才符合名词用法。
grammar · medium
易错句子They tested several repellant before choosing one.
正确表达They tested several repellants before choosing one.
repellant 表示具体的驱避剂产品/种类时是可数名词，前面有 several 时必须用复数 repellants。汉语名词不标复数，容易漏掉词尾 -s。
拼写和读音与 repellant 很像，但意思完全不同：propellant 指推动火箭、喷雾罐等工作的推进剂或发射药；repellant 指用来驱赶动物、给织物防水或表示排斥力的东西。
repulsion 是名词，指物理上的排斥力或强烈的厌恶感，与 repellant 的“排斥力”这一义项相近；但说到驱虫剂、防水剂这类具体产品时，只能用 repellant，不能用 repulsion。
pesticide 靠毒杀起作用，repellant 只是把动物赶走而不杀死它们；涂在身上防蚊的是 insect repellant，用来杀死害虫的是 pesticide。
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