色欲tv国产亚洲_久久午夜夜伦鲁鲁影院_一级特黄无码A片在线观看_免费黄色性感一级片_国内破女处破苞视频hd_欧美三级少妇免费_亚洲美腿丝袜福利一区_白丝秘书被躁到高潮视频av_91麻豆精品分享的内容是很丰富的_国产原创免费av网站

xylem

英 ['za?l?m] 美['za?l?m]
  • n. [植] 木質(zhì)部
暢通詞匯

中文詞源

xylem 木質(zhì)

來自希臘語xylon,木頭。

英文詞源

xylem (n.)
"woody tissue in higher plants," 1875, from German Xylem, coined from Greek xylon "wood" (see xylo-).

雙語例句

1. Sapwood contains xylem vessels, but not as strong as heartwood.
邊材含有木質(zhì)導管, 但不如中心木質(zhì)那樣堅硬.

來自辭典例句

2. The xylem of ferns and conifers contains only tracheids.
蕨類植物和針葉樹的木質(zhì)部僅含有管胞.

來自辭典例句

3. Secondary xylem consists of pitted vessels, parenchyma fibers and rays.
次生木質(zhì)部由孔紋導管 、 薄壁組織及射線所組成.

來自辭典例句

4. A system confined to the transport of mineral elements is known as the xylem.
專門用來運輸?shù)V物元素的系統(tǒng)稱為木質(zhì)部.

來自辭典例句

5. The stele includes all primary tissues derived from the procambium consists of pericycle, phloem and xylem.
中柱包括從原形成層衍生而來的全部初生組織,由中柱鞘 、 韌質(zhì)部和木質(zhì)部組成.

來自辭典例句