【英语时差8,16】瞳孔（上）

Human beings have round pupils; cats have pupils shaped like vertical¹ slits³. What’s the advantage for cats and people, respectively, in those different pupil shapes? Different pupil shapes seem to be an adaptation to different activity patterns during a 24-hour day. Cats belong to the category of nocturnal animals, who do most of their foraging⁴ for food at night. Other nocturnal animals include rats, bats, mice, flying squirrels, and owls⁵. These animals rely heavily on hearing and touch to get around, but they also have the ability to see in very dim light. Their eyes have big lenses and sensitive retinas. But many nocturnal animals, such as cats, are not strictly⁶ nocturnal — they move around during the day as well as at night. They need some way to protect their sensitive eyes in daylight, and slit² pupils provide that protection.

1 vertical   

adj.垂直的，顶点的，纵向的；n.垂直物，垂直的位置

参考例句：

• The northern side of the mountain is almost vertical.这座山的北坡几乎是垂直的。
• Vertical air motions are not measured by this system.垂直气流的运动不用这种系统来测量。

2 slit   

n.狭长的切口；裂缝；vt.切开，撕裂

参考例句：

• The coat has been slit in two places.这件外衣有两处裂开了。
• He began to slit open each envelope.他开始裁开每个信封。

3 slits   

n.狭长的口子，裂缝( slit的名词复数 )v.切开，撕开( slit的第三人称单数 )；在…上开狭长口子

参考例句：

• He appears to have two slits for eyes. 他眯着两眼。
• "You go to--Halifax,'she said tensely, her green eyes slits of rage. "你给我滚----滚到远远的地方去！" 她恶狠狠地说，那双绿眼睛冒出了怒火。

4 foraging   

v.搜寻（食物），尤指动物觅（食）( forage的现在分词 )；（尤指用手）搜寻（东西）

参考例句：

• They eke out a precarious existence foraging in rubbish dumps. 他们靠在垃圾场捡垃圾维持着朝不保夕的生活。 来自《简明英汉词典》
• The campers went foraging for wood to make a fire. 露营者去搜寻柴木点火。 来自辞典例句

5 owls   

n.猫头鹰( owl的名词复数 )

参考例句：

• 'Clumsy fellows,'said I; 'they must still be drunk as owls.' “这些笨蛋，”我说，“他们大概还醉得像死猪一样。” 来自英汉文学 - 金银岛
• The great majority of barn owls are reared in captivity. 大多数仓鸮都是笼养的。 来自辞典例句

6 strictly   

adv.严厉地，严格地；严密地

参考例句：

• His doctor is dieting him strictly.他的医生严格规定他的饮食。
• The guests were seated strictly in order of precedence.客人严格按照地位高低就座。