Our mouths and tongues have taste buds, which are receptors for the five basic flavors: sweet, salty, sour, bitter, and umami, or what is more commonly referred to as savory.
我们的嘴巴和舌头上都有味蕾。味蕾是五种基本味道的感受器：甜、咸、酸、苦和鲜味，也就是通常所说的咸味。
They evolved to recognise only a few basic tastes in order to quickly identify toxins, which in nature are often quite bitter or acidly sour.
它们进化到能够识别出几种基本的味道，以便快速辨别毒素，而毒素在自然界中通常是很苦或很酸的。
The basic operating requirements of sour water stripping tower are presented through analyzing the properties of solutions containing volatile weak electrolytes, such as ammonia and hydrogen sulfide.
从含硫酸性污水汽提法的原理着手，分析得到了汽提塔的基本操作条件。
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