1. Variations from place to place are due to factors such as rainfall, evaporation, biological activity and radioactive decay. 
   由于受降雨、蒸发、生物活动以及放射性衰变等因素的影响，不同的海区海水盐度也不同。
2. To alter the structure of(a protein), as with heat, alkali, or acid, so that some of its original properties, especially its biological activity, are diminished or eliminated. 
   使变质改变（蛋白质的）结构，例如通过加热、加碱、加酸等等，以减少或消除（蛋白质）原有的某些特性，尤指其生物特性
3. A semiconductor quantum dot originally developed for electronics and now being deployed to detect biological activity in cells is a compelling proof of principle for these types of transdisciplinary endeavors. 
   半导体量子点(粒)是电子学领域的发明创造，但现在却用来探测细胞内部的生理活动。这是跨学科研究活动原则的一个有力证明。
4. Determination of the strength or biological activity of a substance, such as a drug or hormone, by comparing its effects with those of a standard preparation on a test organism. 
   生物鉴定通过将其结果与对试验生物所做标准制剂的比较，来鉴定一种物质的强度或生物活性，如药或激素
5. Here we see cargo vehicles are again at this transshipment point, and we can see that they are accompanied by a decontamination vehicle associated with biological or chemical weapons activity. 
   我们可以看到在这个装运点来往的货车，我们也能看到与之相伴的是与生化武器相关的洗消车。

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