细胞膜;(细菌)胞外被膜

cell envelope的用法和样例：

例句

Complement enzymes attack antigens by puncturing the cell membrane.补体酶通过刺穿细胞膜来攻击抗原。
The cell wall surrounds the cell, but its chalzal ends and the lateral wall with synergid is discontinuous.细胞外被细胞壁，其合点端及侧方与助细胞共同壁不连续。

EEC English 六年级下册7

Lesson 7 A Letter from Jenny第七课 JENNY的一封信 [00:15.48]Let's Join the Chant! [00:21.31]Listen and chant along. [00:23.99]Mail, mail! Is there any mail for me?有我的邮件吗？ [00:35.44]Yes, yes! There is a letter from Jenny.有一封J

发表于:2018-12-13 / 阅读(127) / 评论(0)

EEC小学英语六年级

'One Thousand Dollars,' by O. Henry

One thousand dollars, said the lawyer Tolman, in a severe and serious voice. And here is the money. Young Gillian touched the thin package of $50 bills and laughed. It's such an unusual amount, he explained kindly to the lawyer. If it had been $10,00

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2018年VOA慢速英语(二)月

欧亨利短篇小说《一千美元》

＂One Thousand Dollars,＂ by O. Henry 欧亨利短篇小说《一千美元》 Our story today is called One Thousand Dollars. It was written by O. Henry. Here is Steve Ember with the story. One thousand dollars, said the lawyer Tolman, in a severe

发表于:2019-01-12 / 阅读(138) / 评论(0)

2015年VOA慢速英语(十二)月

Greek FinMin receives bullet in envelope

ATHENS, Feb. 4 (Xinhua) -- Greek Finance Minister Yannis Stournaras received a bullet in the post, Greek media reported on Monday. Stournaras' aides alerted security forces, when they opened the envelope at his office and discovered the enclosed bull

发表于:2019-02-06 / 阅读(52) / 评论(0)

英语新闻

Turn Off Your Cell Phone 关掉你的手机

Turn Off Your Cell Phone 关掉你的手机 We went to the movie the other night. I sat in an aisle seat as I usually do, because it feels a little roomier. Just as the feature was about to start, a blonde from the center of the row got up and starte

发表于:2019-02-07 / 阅读(165) / 评论(0)

趣味英语

英语笑话听力+文本：Come in an envelope 坐信封过来

[00:14.92]Come in an envelope 坐信封过来 [00:26.92]词汇扫描 [00:30.99]torrential [t?'ren??l] 湍急的 [00:34.00]rainstorms ['reinst?:m] 特别猛烈的暴雨 [00:39.08]representative [?repri'zent?tiv] 代表 [00:43.05]weary ['wi?ri] 心焦

发表于:2019-02-15 / 阅读(54) / 评论(0)

英语笑话（MP3+文本）

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学英语单词

adenosine-5'-phosphosulphate

Aleksandr Pavlovich

amarachi

amazonite, amazonstone

binary coded character

bissiri

booza