The rooms are crammed with humming Xerox machines.
那些房间里摆满了嗡嗡作响的.复印机。
Could you xerox this letter, please?
请复印一下这封信好吗？
He kept the original copy and gave her only a Xerox.
他保留下原件而只给了她一份复印件。
Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
次生木质部由孔纹导管、薄壁组织及射线所组成。
The xylem of ferns and conifers contains only tracheids.
蕨类植物和针叶树的木质部仅含有管胞。