Cast iron is an alloy of iron and carbon.
鑄鐵是鐵和碳的合金。
Hydrogen, carbon, nitrogen, phosphorus, oxygen, sulfur and selenium are nonmetals.
氫、碳、氮、磷、氧、硫和硒是非金屬。
You shouldn't sleep with a coal stove on, because it releases a very toxic gas called carbon monoxide. Sleeping with a coal stove running may result in death.
你不應該在燃煤爐上睡覺,因為它會釋放出一種非常有毒的氣體,稱為一氧化碳。在燃煤爐運作的情況下睡覺可能會導致死亡。
Trees give off oxygen and absorb carbon dioxide.
樹木釋放氧氣並吸收二氧化碳。