片语
sieve tube elementProton gradient: Solid green: sieve tube; dashed green: sieve tube plates; light pink: companion cell; dark pink: nucleus; yellow: nutrients
sandy sieve tube method砂滤管
sieve e tube筛管细胞
sieve tube member筛管节
sieve-tube cell筛管细胞
vessel form sieve tube导管型筛管
slotted sieve tube割缝筛管