Four-Stage Animal Life Cycles · 四阶段动物生命周期

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Read Out Loud · 大声朗读

课文朗读 · 点播放键听整段

🪲 Life cycle of a mealworm beetle · 面包虫甲虫的生命周期

The life cycle of a mealworm beetle has four stages: the egg, the larva, the pupa and the adult. The larva lives on land, does not look like the adult, eats a lot, and moults many times. The pupa does not eat and does not look like the adult. It continues to develop into an adult in the pupal case. The adult has wings and can fly.

面包虫甲虫的生命周期有四个阶段：卵、幼虫、蛹和成虫。幼虫生活在陆地上，外形与成虫不同，大量进食，并多次蜕皮。蛹不进食，外形与成虫不同，在蛹壳内继续发育成成虫。成虫有翅膀，能飞。

💡 In 4-stage life cycles, both the larva and pupa do NOT look like the adult. 在四阶段生命周期中，幼虫和蛹都与成虫外形不同。

🦋 Life cycle of a butterfly · 蝴蝶的生命周期

The butterfly has four stages: egg, larva, pupa and adult. The egg is laid on a leaf by the adult butterfly. The larva is also called a caterpillar. It lives on land, does not look like the adult, eats a lot, and moults many times. The pupa does not eat and does not look like the adult. It continues to develop into an adult. The adult butterfly has wings and can fly.

蝴蝶有四个阶段：卵、幼虫、蛹和成虫。卵由成年蝴蝶产在叶子上。幼虫也叫毛毛虫，生活在陆地，外形与成虫不同，大量进食，多次蜕皮。蛹不进食，外形与成虫不同，继续发育成成虫。成年蝴蝶有翅膀，能飞。

🌿 Caterpillars have six true legs plus five pairs of prolegs (false legs) that help them move. They lose their prolegs when they become adults. 毛毛虫有六条真足和五对伪足（假腿），成虫后失去伪足。

🦟 Life cycle of a mosquito · 蚊子的生命周期

The mosquito has four stages: egg, larva, pupa and adult. The egg is laid in stagnant water by the adult mosquito. The larva is called a wriggler. It lives near the water surface, does not look like the adult, eats a lot, and moults. The pupa lives near the water surface, does not eat, and does not look like the adult. The adult mosquito lives on land, has wings and can fly.

蚊子有四个阶段：卵、幼虫、蛹和成虫。卵由成年蚊子产在积水中。幼虫叫孑孓，生活在水面附近，外形与成虫不同，大量进食并蜕皮。蛹生活在水面附近，不进食，外形与成虫不同。成年蚊子生活在陆地，有翅膀，能飞。

🦟 Dengue fever · 登革热

Dengue fever is a disease spread by infected mosquitoes such as Aedes aegypti. When temperatures and rainfall are higher, mosquitoes breed more quickly. We can reduce the number of mosquitoes by removing their breeding spots — remember B-L-O-C-K: Break up hardened soil, Lift and empty flowerpot plates, Overturn and wipe pails and tins, Change water in vases, Keep roof gutters clear.

登革热是由受感染的蚊子（如埃及伊蚊）传播的疾病。气温高、降雨多时，蚊子繁殖更快。我们可以通过清除蚊子孳生地来减少蚊子数量——记住B-L-O-C-K：翻开硬化土壤、提起花盆底碟、翻转水桶和锡罐、更换花瓶水、保持屋顶排水沟畅通。

⚠️ Key fact: Mosquitoes lay their eggs in stagnant water. Removing stagnant water stops the life cycle! 关键：蚊子在积水中产卵。清除积水能打断生命周期！

⭐ Key Fact · 关键知识点

There are three or four stages in the life cycles of different animals. A life cycle with three stages includes the egg, the young and the adult. A life cycle with four stages includes the egg, the larva, the pupa and the adult.

不同动物的生命周期有三个或四个阶段。三阶段生命周期包括：卵、幼体和成体。四阶段生命周期包括：卵、幼虫、蛹和成虫。