- e231 series
- 系: system; series
- 系: 系动词(打结; 扣) tie; fasten; do up; button up 把晾衣服绳系在树上 fasten a clothesline between two trees; 把衣服扣子系上button up a jacket; 系围裙 wear an apron; 系鞋带 tie shoe laces
- e231 series: jr东日本e231系电车; jr东日本e231系电力动车组
- 07系: tōkyō metro 07 series
- 0系: 0 series shinkansen
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