通过献血，数百万生命得以挽救。每年的6月14日为世界献血日。我们要对献血者说声谢谢。所有国家都提高了对献血的重视程度。多数献血者自愿献血，但许多国家为有偿献血。医生称无偿献血者通常较为安全。全球献血体制几乎一样。献血后，工作人员会给你一杯免费茶，或许还有饼干。在发展中国家，对于血的需要尤为突出。对于发展中国家，全球血液供应量不到40%，而却占据了全球82%的人口。

Blood is, of course, the red liquid that makes some of us faint when we see it. It delivers oxygen and vital nutrients, such as glucose, amino acids, and fatty acids, to our body's cells. It also carries away waste products, like carbon dioxide, from our cells to keep our body clean. Seven per cent of our body weight is blood. The average adult has about five litres of blood. Our heart pumps blood around our body at high speed. It travels through a system of arteries and veins, that reach every part of our body. Our blood is made up of red blood cells, white blood cells and platelets. When we cut ourselves, it is the job of platelets to clot the blood to stop us bleeding. We all have one of four different blood types. If we are given a different blood type, we’ll die.

有人看见红色液体（血）会出现眩晕情况。通过血液传播，氧气以及像葡萄糖、氨基酸以及脂肪酸等重要营养物可传递到细胞中。它还可清除细胞中的废物，像二氧化碳等废物可通过血液清除，保持身体清洁干净。体重的7%为血液。成人平均血液含量为五升。心脏高速运转血液。穿过动脉和静脉系统流经全身。血液由红细胞、白细胞以及血小板组成。一旦身体被划破，血小板会帮助凝结血液，止住流血。人类共有四种血液类型。一旦血液不匹配，死亡情况就会发生。

1.fatty acid 脂肪酸

例句：GC-MS was used to detect the fatty acid composition and content.

并采用GC-MS法检测了油脂的脂肪酸组成和含量。

2.amino acid 氨基酸

例句：Protein amino acid content of two components, namely, cystine and methionine.

蛋白质中有两个含硫的氨基酸组成成分，即胱氨酸和蛋氨酸。

3.such as 例如

例句：Trees such as spruce, pine and oak have been planted.

种植了云杉、松树和橡树等树木。

4.stop doing 停止做

例句：Hearing the doorbell,she stopped washing the dishes.

听见门铃声，她停止洗碗了。