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酸素， さんそ

1. oxygen (O)

tbd

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元素， 原素， げんそ

1. element, chemical element 2. (classical) element (e.g. earth, water, air, fire) 3. origin, source

元素

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である

1. be, is

是、=です、=だ

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鉄， 鐵， てつ

1. iron (Fe) 2. steel 3. iron (will, discipline, lady, etc.) 4. railway 5. railway enthusiast

tbd

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は

1. indicates sentence topic 2. indicates contrast with another option (stated or unstated) 3. adds emphasis

指示句子的主题

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