a swarm of locusts
swarm 指“一大群（飞行昆虫）”，后接复数名词 locusts。
A swarm of locusts can strip a field of crops in minutes.
一群蝗虫能在几分钟内把田里的庄稼吃光。
温暖地区的迁徙蝗虫,短触角；各种洋槐树的硬木；豆科的各种硬木树；蚱蜢；蝉
a migratory grasshopper of warm regions having short antennae
Any of the grasshoppers, often polyphenic and usually swarming, in the family Acrididae that are very destructive to crops and other vegetation, especially migratory locusts (Locusta migratoria).
温暖地区的迁徙蝗虫,短触角
migratory grasshoppers of warm regions having short antennae
Any of various often leguminous trees and shrubs, especially of the genera Robinia and Gleditsia; locust tree.
各种洋槐树的硬木
hardwood from any of various locust trees
A cicada.
豆科的各种硬木树
any of various hardwood trees of the family Leguminosae
A swarm of locusts destroyed the farmer's crops.
一群蝗虫毁坏了农民的庄稼。
用法提示：locusts 是 locust 的复数形式，作名词，指蝗虫。
The locust landed on a leaf and ate it in minutes.
一只蝗虫落在叶子上，几分钟就把它吃光了。
用法提示：此处 locust 为单数名词，指蝗虫。
Scientists are studying how locusts communicate to prevent outbreaks.
科学家正在研究蝗虫如何交流，以防爆发蝗灾。
用法提示：locusts 为复数，泛指蝗虫这类昆虫。
swarm 指“一大群（飞行昆虫）”，后接复数名词 locusts。
A swarm of locusts can strip a field of crops in minutes.
一群蝗虫能在几分钟内把田里的庄稼吃光。
plague of locusts 是固定搭配，强调蝗灾的严重性和破坏性。
The country is battling the worst plague of locusts in living memory.
该国正在与人们记忆中最严重的蝗灾作斗争。
descend on 表示“突然大批到达”，常用来描述蝗虫等生物的入侵。
Millions of locusts descended on farms across the province.
数百万只蝗虫突然降临该省各地的农田。
‘grasshopper’ 为蚱蜢的统称，常不强调“成群迁飞”的特征；非正式语境中可替代 locust，但需要严格区分时仍用 locust 特指迁飞蝗虫。
‘migratory grasshopper’ 是 locust 的定义式近义词，突出迁飞性，语气较书面、技术化，日常口语中不如 locust 常用。
grammar · medium
易错句子A swarm of locust has eaten all the crops.
正确表达A swarm of locusts has eaten all the crops.
locust 是可数名词，a swarm of（一群）后面要接复数名词，所以必须写 locusts。中文里“蝗虫”没有复数形式，容易漏加 -s；在英语中，量词短语后的可数名词用复数，而主语是 a swarm，谓语仍用单数 has。
grammar · medium
易错句子The locusts is destroying the rice.
正确表达The locusts are destroying the rice.
主语 locusts 是复数，英语的 be 动词要与主语在数上一致，因此用 are，不能用 is。中文动词没有单复数变化，所以学习者要记住复数主语搭配复数谓语。
locust 特指成群迁飞、能造成蝗灾的蝗虫；grasshopper 泛指一般的蚱蜢，通常不集群迁飞。
cicada 是蝉（知了），雄虫会鸣叫；locust 是蝗虫，不会像蝉那样鸣叫。
cricket 指蟋蟀，多在夜间鸣叫；locust 是蝗虫，以成群迁飞著称。
一群蝗虫
A swarm of locusts destroyed the crops.
一群蝗虫毁掉了庄稼。
沙漠蝗虫
The desert locust is a major agricultural pest.
沙漠蝗虫是一种主要的农业害虫。
蝗灾
The plague of locusts devastated the region.
蝗灾摧毁了该地区。
像蝗虫一样（大批地）
Tourists descended on the village like locusts.
游客们像蝗虫一样涌进村庄。
蝗虫常成群移动，形成蝗群。
历史上蝗灾常被描述为一种灾难。
蝗灾会大量啃食农作物。
沙漠蝗虫是常见的蝗虫种类之一。
指害虫大量出现并造成危害的现象。
像蝗虫一般（成群结队地涌来并大肆消耗）
The tourists arrived like locusts, stripping the village shops bare.
游客像蝗虫一样蜂拥而至，把村里的商店扫荡一空。
蝗灾；喻指蜂拥而至的破坏性群体
Reporters descended on the town like a plague of locusts after the news broke.
消息传出后，记者们像蝗灾一样蜂拥涌入这座小城。
（经济艰难或物资匮乏的）困顿年代
The country is determined not to return to the locust years of the last recession.
这个国家决意不再回到上次衰退时那种困顿年代。
我必补还你们，就是蝗虫、蝻子、蚂蚱、剪虫那些年所吃的；那是我打发到你们中间的大军。
After losing his business, he often quoted the promise that the locust years would be restored.
生意失败后，他常引用那句应许：蝗虫吃掉的岁月必被补还。
蝗虫上来，布满埃及遍地，极其厉害；以前没有这样的，以后也必没有。
The plague of locusts in the movie was so vast that it felt like a scene straight out of Exodus.
电影中的蝗灾规模如此浩大，仿佛《出埃及记》里的场景。
Dictionary facts from ECDICT, WIKTIONARY.