第一岛链 dìyīdǎoliàn First Island Chain Origin Definitions Defs Strokes Stroke Words Sentences Sents 第一 dìyī numeral first occupying the lead position in a sequence, order, or ranking; the first岛链 島鏈 dǎoliàn noun island chain A chain or string of islands geographically arranged in a line; specifically used in military strategy to describe defensive or offensive maritime perimeters.