Some animals do not keep their hard parts inside the body, the way we keep bones. Insects, spiders, crabs, and lobsters grow a hard shell on the outside instead. That outer shell is an exoskeleton.

Some animals有些動物 do not keep their hard parts inside the body不會把身體堅硬的部分放在體內 the way we keep bones不像我們把骨頭放在裡面那樣 Insects, spiders, crabs, and lobsters昆蟲、蜘蛛、螃蟹和龍蝦 grow a hard shell on the outside instead反而是在身體外面長出一層硬殼 That outer shell這層外殼 is an exoskeleton就是外骨骼

It holds the body up, keeps it safe, and gives muscles something to pull against. When the animal gets too big for the old shell, it has to climb out and wait for a new one to harden — that is why empty crab shells turn up on the beach.

It holds the body up它撐起身體 keeps it safe保護身體 and gives muscles something to pull against也讓肌肉有東西可以施力 When the animal gets too big for the old shell當動物長大到舊殼裝不下時 it has to climb out牠就得爬出來 and wait for a new one to harden等新的殼變硬 — that is why empty crab shells turn up on the beach這就是為什麼海灘上會出現空的蟹殼

The word is a bit scientific; you meet it in nature class first.

The word is a bit scientific這個詞有點科學性 you meet it in nature class first你通常會先在自然課上遇到它

Though actually, people also use it for a machine you wear, a robot frame that helps a person stand or lift heavy things. That later meaning is the same picture, just built of metal instead of shell.

Though actually不過事實上 people also use it人們也會用這個詞 for a machine you wear指一種你穿在身上的機器 a robot frame一種機器人骨架 that helps a person stand or lift heavy things幫助人站立或搬起重物 That later meaning這個後來的意思 is the same picture跟原本是同一幅畫面 just built of metal instead of shell只是材質從殼變成了金屬