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    One day, I saw a boy shop alone at the shop I worked. He chose some school things he wanted and went to the checkout (付款台).

    The young shop assistant (店员) told him he needed to pay $37.60. The boy became very sad and said he only had $20. He took out one thing at a time, and at last he got down to his $20. He cried and asked if he could call his mum to pick him up. He called his mum. However, his mum was too busy to pick him up in a minute.

    He tried to stop crying and walked outside to wait on the chair in front of the shop. This was too much for the young assistant. She looked outside all the time to see if the boy was all right. Then she said, "I hope I can pay for the rest (剩余部分) of his things." One of the other girls said she had some money. Then two others said they could help too.

    These four young girls pooled their money and found they had more than enough to pay for the boy's things. Then they chose more school things, and gave them all to the boy. The boy smiled happily~ His mum arrived much later, but he didn't just run to the car; he ran back into the shop and called out, "Thank you!"

    I was so proud (骄傲的) of my team that day. They did something wonderful for that boy and also found the pleasure (快乐) of giving.

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奇妙的唾液

       ①唾液,俗称口水、口涎,它是口腔内各种腺体所分泌的黏稠状液体。大的唾液腺有三对:腮腺、颌下腺、舌下腺;小的有唇腺、舌腺、颊腺、腭腺等。唾液腺虽小,却是个很勤快的器官,一个成年人,一昼夜间可以分泌出1000﹣1500毫升唾液。唾液实际上是维持人体生命活动的重要物质之一。

       ②唾液的作用很多,我们的口腔里假如没有唾液,咽不下食物是不必说的,就连嘴巴恐怕也张不开。因为我们的舌头之所以能在口腔里“运转自如”,完全是因为有唾液在里面起“润滑油”的作用。而这种“润滑油”一旦失去的话,舌头就会和上颚或者下颚的表皮粘在一起,于是我们口腔内的一整套“机械”也就只好“束之高阁”了。

       ③唾液具有抗菌和凝血的作用,所以口腔里的伤口往往比其他地方好得快。拔牙或牙龈手术后很少发生感染,主要原因就在于唾液中的溶菌酶有杀菌的能力,可阻止口腔内细菌大量繁殖。美国科学家发现,唾液中有一种特殊的化学特质﹣﹣唾液生长因子,它能显著地缩短伤口的愈合时间,井可以止血。

       ④近年来,医学家们发现唾液对污染食物中的致癌物具有消毒作用。日本生物化学专家研究发现,唾液中有很多免疫球蛋白,对食物中的异常蛋白质有极高的凝聚力,可增强人体的防卫功能。唾液中所含的溶菌酶时强烈致癌的黄曲霉素、苯并芘、亚硝胺有很好的解毒作用。也就是说,唾液相当于一种天然防癌剂,具有令致癌物质转化为无害物质的功能。它将发霉食物中的致癌物质黄曲霉素与自己混合,再作用于动物体内细胞,使原来具有较强致癌作用的毒性物质几乎全部消失。

       ⑤古代中医说:“白玉齿边有玉泉,涓涓育我度长年。”意思是说,常咽唾液可以健康长寿。医学专家研究发现,唾液中还含有一种能使人保持年轻的激素,这种激素是由三大唾液腺之一的腮腺分泌的,被称为“腮腺激素”。它之所以能使人年轻,是因为它能强化肌肉、血管、结缔组织、骨骼及软骨、牙齿的活力,尤其能增强血管的弹性和结缔组织的活力,只要腮腺激素充盈,血管和皮下组织(疏松结缔组织)的作用就会加强,皮肤的弹性就会得到保持。唾液的特殊功能触发了化妆品制造商的灵感,他们开发出“唾淀化妆品”﹣﹣抗皱霜、洗面奶等。

(摘自《百科知识》,有删改)