?筛管节

... 筛管部 phloem 筛管节 sieve tube members; sieve tube segment 成分 1.(组成部分) composition; component part; ingredient; constituent; reactant; element; unit 肥料成分 the composition of a fertilizer; 化学成分 chemical composition; 土壤成分 composition of the soil2.(个人成分) one's profession or economic status 阶级成分 class status ...