nounB1
酸素
a gas in the air that living things need to breathe
例文
Trees and plants help to put oxygen back into the air.
木や植物は空気中に酸素を戻す手助けをする。
酸素
a gas in the air that living things need to breathe
例文
Trees and plants help to put oxygen back into the air.
木や植物は空気中に酸素を戻す手助けをする。