基本解释琯胞同根派生 tracheids相关词英汉例句The xylem of ferns only contains tracheids.蕨類植物的木質部衹含有琯胞。It is found in protoxylem and first metaxylem tracheids and vessels.可在原生木質部和初始後生木質部的琯胞和導琯中見到。tracheids更多例句