【英语时差8,16】蜗牛（中）

Now here’s the strange part. About once a week, as garden snails² share caresses³, pressure builds up in the area surrounding a sac near the genital region housing a calcium⁴ dart⁵. Just for the moment of sexual penetration⁶, the impregnating snail¹ stabs its partner near the genitals with what scientists have dubbed⁷ the snail love dart. But what might sound like a nasty sadomasochistic ritual does have a practical purpose. According to one study, the darts⁸ are tipped with a chemical preventing the snail on the receiving end from digesting most of its mate’s sperm⁹. As in many species, the garden snail’s female reproductive tract¹⁰ is hostile to sperm, allowing only the toughest and most resilient to fertilize¹¹ the egg. To increase its chances of passing on its genes¹², the impregnating snail fires a dart to give its sperm a fighting chance.

 

1 snail   

n.蜗牛

参考例句：

• Snail is a small plant-eating creature with a soft body.蜗牛是一种软体草食动物。
• Time moved at a snail's pace before the holidays.放假前的时间过得很慢。

2 snails   

n.蜗牛；迟钝的人；蜗牛( snail的名词复数 )

参考例句：

• I think I'll try the snails for lunch—I'm feeling adventurous today. 我想我午餐要尝一下蜗牛——我今天很想冒险。 来自《简明英汉词典》
• Most snails have shells on their backs. 大多数蜗牛背上有壳。 来自《简明英汉词典》

3 caresses   

爱抚，抚摸( caress的名词复数 )

参考例句：

• A breeze caresses the cheeks. 微风拂面。
• Hetty was not sufficiently familiar with caresses or outward demonstrations of fondness. 海蒂不习惯于拥抱之类过于外露地表现自己的感情。

4 calcium   

n.钙(化学符号Ca)

参考例句：

• We need calcium to make bones.我们需要钙来壮骨。
• Calcium is found most abundantly in milk.奶含钙最丰富。

5 dart   

v.猛冲，投掷；n.飞镖，猛冲

参考例句：

• The child made a sudden dart across the road.那小孩突然冲过马路。
• Markov died after being struck by a poison dart.马尔科夫身中毒镖而亡。

6 penetration   

n.穿透，穿人，渗透

参考例句：

• He is a man of penetration.他是一个富有洞察力的人。
• Our aim is to achieve greater market penetration.我们的目标是进一步打入市场。

7 dubbed   

v.给…起绰号( dub的过去式和过去分词 )；把…称为；配音；复制

参考例句：

• Mathematics was once dubbed the handmaiden of the sciences. 数学曾一度被视为各门科学的基础。
• Is the movie dubbed or does it have subtitles? 这部电影是配音的还是打字幕的？ 来自《简明英汉词典》

8 darts   

n.掷飞镖游戏；飞镖( dart的名词复数 )；急驰，飞奔v.投掷，投射( dart的第三人称单数 )；向前冲，飞奔

参考例句：

• His darts trophy takes pride of place on the mantelpiece. 他将掷镖奖杯放在壁炉顶上最显著的地方。 来自《简明英汉词典》
• I never saw so many darts in a bodice! 我从没见过紧身胸衣上纳了这么多的缝褶！ 来自《简明英汉词典》

9 sperm   

n.精子，精液

参考例句：

• Only one sperm fertilises an egg.只有一个精子使卵子受精。
• In human reproduction,one female egg is usually fertilized by one sperm.在人体生殖过程中，一个精子使一个卵子受精。

10 tract   

n.传单，小册子，大片(土地或森林)

参考例句：

• He owns a large tract of forest.他拥有一大片森林。
• He wrote a tract on this subject.他曾对此写了一篇短文。

11 fertilize   

v.使受精，施肥于，使肥沃

参考例句：

• Fertilizer is a substance put on land to fertilize it.肥料是施在地里使之肥沃的物质。
• Reading will fertilize his vocabulary.阅读会丰富他的词汇。

12 genes   

n.基因( gene的名词复数 )

参考例句：

• You have good genes from your parents, so you should live a long time. 你从父母那儿获得优良的基因，所以能够活得很长。 来自《简明英汉词典》
• Differences will help to reveal the functions of the genes. 它们间的差异将会帮助我们揭开基因多种功能。 来自英汉非文学 - 生命科学 - 生物技术的世纪