难理解点。

易翻错点。

素食主义者

不受良心谴责的，无愧疚的

这里指养狗的人，大家需注意。

你好，食物

N-UNCOUNT Food can be referred to as chow. 食物 [美国英语] [非正式]

费城

having paid the due, full, or required fee to be a member of an organization, club, political party, etc 已付了应支付的、完整的或必须的费用的; 已成为组织、俱乐部、政党等的会员

狼吞虎咽地吃

A concoction is something that has been made out of several things mixed together. 调制品

If you describe something or someone as nondescript, you mean that their appearance is rather dull, and not at all interesting or attractive. 毫无特色的; 毫无兴趣的; 毫无吸引力的

（尤指给宠物的）粗磨食物；干狗（猫）食；矿井内使用的）铁吊桶

Someone who is fussy is very concerned with unimportant details and is difficult to please. 爱挑剔的 [表不满]

A vat is a large barrel or tank in which liquids can be stored. 大桶; 缸

绿色资格；环保信誉

If you retreat, you move away from something or someone. 退出; 离开

N-VAR A misapprehension is a wrong idea or impression that you have about something. 误解; 误会

Someone who is diplomatic is careful to say or do things without offending people. 圆通得体的

豪华的；长毛绒做的；舒服的

捐赠者；供者；赠送人

尽力；用心

唯恐，以免；（引出产生某种情感的原因）唯恐，担心

活组织检查；活组织切片检查；切片检查法

鼠（或相关啮齿动物）的，感染鼠的

原始的；根本的；原生的

掠夺的，掠夺成性的；食肉的；捕食生物的

空想主义者；愿景者；远见者（visionary的复数）

N-COUNT Rodents are small mammals which have sharp front teeth. Rats, mice, and squirrels are rodents. 啮齿动物

猫科的

无负担 无内疚

细胞培养物

adv. from the beginning 从头做起

N-COUNT If you are in a quandary, you have to make a decision but cannot decide what to do. 不知所措

n. a strict vegetarian; someone who eats no animal or dairy products at all

N-COUNT A vegetarian is someone who is vegetarian. 素食者

https://m.baike.com/wiki/%E5%B1%82%E6%B5%81%E5%92%8C%E6%B9%8D%E6%B5%81/503532?search_id=202101271825570100110411350D00F606&baike_source=baike_hudong_structure_new!

视频：https://m.ixigua.com/video/6915322334173889031/

氧气

古时的高官

The problem appears in different stories about the invention of chess. One of them includes the geometric progression problem. The story is first known to have been recorded in 1256 by Ibn Khallikan.[3] Another version has the inventor of chess (in some tellings Sessa, an ancient Indian Minister) request his ruler give him wheat according to the wheat and chessboard problem. The ruler laughs it off as a meager prize for a brilliant invention, only to have court treasurers report the unexpectedly huge number of wheat grains would outstrip the ruler's resources. Versions differ as to whether the inventor becomes a high-ranking advisor or is executed. https://en.m.wikipedia.org/wiki/Wheat_and_chessboard_problem

湍流

科罗拉多的拉克斯珀

穿透的，渗透性的

沸石

https://3g.163.com/v/video/VHQGLISST.html

制造氧气：磁矩-如何用磁铁从空气中分离氧气？如果成功的话，这种至关重要的天然气体会变得更便宜。（全文702词）

adj. 薄片状的，由薄片组成的；层流的；层状的，板状的

n. [机] 孔；[机] 内径（bore的复数）

直径

n. 毫米；千分之一米

微通道

原料，组成部分

a device that produces a current of air 鼓风机

adj. 大气的，大气层的

n. a temporary magnet made by coiling wire around an iron core; when current flows in the coil the iron becomes a magnet 电磁铁

脉冲电磁铁

缺乏氧气的

富含氧气的

n. a product of your creative thinking and work 脑力劳动的产物

the process of purifying a liquid by boiling it and condensing its vapors蒸馏

液化

污染气体

n. [化学] 氩

扣押；隔离；（使）隔绝、隐蔽；

氧气

化石燃料

认为，估计

药物

比喻上地，隐含。Figuratively has the exact opposite meaning of literally and means in an analogous, but not exact, sense.

确实地，真地。Literally means word for word and means in an exact sense. It should not be used loosely as an intensifier.

n.蝙蝠