「地下鉄」 (chikatetsu) means "subway" or "underground train." It's a type of train that primarily runs through tunnels beneath the city. You use it when referring to this specific kind of urban rail transport. Example: 地下鉄で駅に行きます。 (I'll go to the station by subway.)
「地下(ちか)鉄(てつ)」は、地下(ちか)を走(はし)る電車(でんしゃ)です。都市(とし)の移動(いどう)によく使(つか)われます。例(れい):地下(ちか)鉄(てつ)に乗(の)ります。
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