相关单词同义词eldest son, eldest daughter, 近义词 eldest 最年长的临近词firsts, first, first buyer, first shift, first draft, first entry, First Fleet, firstfruits, first force, first order, first-run, first sugar相似词first-rate, first-time buyer, first-wave, first-world problem, firsthand, firstly, firth, fisc, 返回 firstborn