1
apply a herbicide to sth
herbicide 是可数名词，常用单数形式。
Farmers apply a herbicide to the field to control weeds.
农民在田里施用除草剂以控制杂草。
除草剂
先理解核心含义，再看它在真实句子里的用法。
除草剂
herbicide
Farmers apply a herbicide to the field to control weeds.
农民在田里施用除草剂以控制杂草。
A substance used to kill plants.
破坏植物或抑制其生长的化学剂
a chemical agent that destroys plants or inhibits their growth
The farmer sprayed herbicide on the weeds to protect the corn crop.
农民在杂草上喷洒除草剂以保护玉米作物。
Before planting, we applied an herbicide to clear the overgrown lot.
种植前，我们施用了除草剂来清理杂草丛生的空地。
Some gardeners prefer natural methods and avoid using chemical herbicides.
一些园丁更喜欢天然方法，避免使用化学除草剂。
herbicide 是可数名词，常用单数形式。
Farmers apply a herbicide to the field to control weeds.
农民在田里施用除草剂以控制杂草。
This herbicide kills broadleaf weeds without harming the grass.
这种除草剂能杀死阔叶杂草而不伤害草坪。
resistant to 后接 herbicide 或 herbicides 均可。
Some weeds have become resistant to herbicide.
一些杂草已经对除草剂产生了抗性。
Not this
There are many herbicide on the market.
Use this
There are many herbicides on the market.
herbicide 是可数名词，在 many 后必须用复数形式；其复数形式为 herbicides。
Not this
Farmers spray insecticide to kill weeds.
Use this
Farmers spray herbicide to kill weeds.
insecticide 是“杀虫剂”，专门杀昆虫；除草要用 herbicide（“除草剂”）。该句说的是 kill weeds，所以不能用 insecticide。
Not this
We need to herbicide the field before planting.
Use this
We need to apply herbicide to the field before planting.
herbicide 是名词（除草剂），不能直接作动词使用；表示“施用除草剂”要用动词短语 apply/use + herbicide，再通过 to 引出对象。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
广谱除草剂
Farmers often use a broad-spectrum herbicide to clear weeds before planting.
农民常在种植前使用广谱除草剂清除杂草。
选择性除草剂
A selective herbicide kills weeds without damaging the crop.
选择性除草剂在杀死杂草的同时不会伤害作物。
内吸性除草剂
This systemic herbicide is absorbed through the leaves and travels to the roots.
这种内吸性除草剂通过叶片吸收并输送到根部。
施用除草剂
You should apply the herbicide on a calm day to prevent drift.
你应该在无风的日子施用除草剂，以防药剂飘移。
除草剂抗性
Continuous use of the same chemical can lead to herbicide resistance in weeds.
持续使用同一种化学药剂会导致杂草产生除草剂抗性。
Use herbicide naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 herbicide 拆成 herb（草）+ cide（杀），想象拿着喷壶向杂草喷除草剂。
语域：formal 常见场景：agriculture、environmental policy、scientific writing herbicide 多用于正式或技术性场合，常见于农业、环保和科学文本；日常口语中比较常用 weed killer。
Genuine sound matches: pesticide, suicide, homicide, genocide, and decide share the final /saɪd/ sound with herbicide, and side also ends with /saɪd/. Note that in herbicide the primary stress is on the first syllable, but the final -cide is a secondary-stressed rhyming syllable. Beware of lookalikes that sound different, such as cider /ˈsaɪdər/ and deciduous /dɪˈsɪdʒuəs/.
Dictionary facts from ECDICT, WIKTIONARY.