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词汇 Open cover
分类 英语词汇 英语翻译词典
释义

Open cover

原声例句
头脑特工队2

But as she went to open the cover, she started to cry.

但就在她要打开封面时,她却开始哭泣。

101个儿童英语故事

The little Klaus opened the cover of the box and took out the priest.

小克劳斯打开箱子的盖子,把牧师放了出去。

航海英语听力

53.the position of block for opening no.2 hatch cover is incorrect and the block not turn.

2舱盖开舱滑车错位,滑车不转。

稻草人

" That is my idea, exactly, " said the Scarecrow, and taking a small box from his pocket he opened the cover and tossed the contents toward Blinkie.

“这正是我的想法,”稻草人说着,从口袋里拿出一个小盒子,打开盖子,把里面的东西扔给布林奇。

航海英语听力

20.the opening hatch cover method also not to be satisfied that using the warping head of cargo gear not through derrick boom open the hatch cover because using derrick boom is not safe.

开舱盖的方法不令人满意,起货设备传动轮弯头在开舱时不穿过吊杆,原因为使用吊杆不安全。

百年孤独

Aided as was customary by Aureliano Segundo, they broke the seals, opened the cover, took out the protective sawdust, and found inside a long lead chest closed by copper bolts.

按照惯例,在奥雷里亚诺第二的帮助下, 他们打开封条,打开盖子,取出保护性木屑, 发现里面有一个用铜螺栓封闭的长铅箱。

塔中恋人(下)

The postman had delivered among other things an illustrated newspaper, sent by a hand she did not recognize; and on opening the cover the sheet that met her eyes filled her with a horror which she could not express.

邮递员还送来了一份带插图的报纸,是她不认识的人寄来的。一打开盖子,被单映入她的眼帘,她心中充满了一种无法表达的恐惧。

中文百科

覆盖 (拓扑学) Cover (topology)

(重定向自Open cover)

在数学中,若 X 是一个集合搜集 C 索引的集合中并集的子集,则集合搜集 C 是集合 X覆盖。用符号来说,如果 C = \lbrace U_\alpha\rbrace_{\alpha \in A}X 的子集索引族,则 C 是如下条件下的覆盖(定义可参见: Gamelin 与 Greene 第19页或 Kelly 第49页)

X \subseteq \bigcup_{\alpha \in A}U_{\alpha}

更一般的说,如果 YX 的子集,而 CX 的子集 U_\alpha 的搜集,它的并集包含 Y,则 C 被称为是 Y 的覆盖。也就是 CY 的覆盖如果

\bigcup_{\alpha \in A}U_{\alpha} \supseteq  Y
英语百科

Cover (topology) 覆盖 (拓扑学)

(重定向自Open cover)

In mathematics, a cover of a set X is a collection of sets whose union contains X as a subset. Formally, if

C = \lbrace U_\alpha: \alpha \in A\rbrace

is an indexed family of sets U_\alpha, then C is a cover of X if

X \subseteq \bigcup_{\alpha \in A}U_{\alpha}.
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