估算建立在预期的内部化学成分上，但我们从来没有实际地测量放射性物质在热量产生中发挥的作用。
Estimates have been made based on the expected chemical composition of the interior, but we've never actually measured the radiogenic contribution.
在过去30年里，他们通过跟踪测定臭氧层中化学物质的含量来估算臭氧层的破坏程度。
They point to the way their estimate of chemically destroyed ozone closely tracks the amount of chemicals in the hole during the past 30 years.
这些试剂包括测序的主要成本，且大多数人类基因组的测序成本估算都是计算使用的化学品的成本。
These reagents comprise the major cost of sequencing, and most estimates of the cost to sequence a human genome with a particular technology are calculated using the cost of the chemicals.
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