最大的问题还在于，在那些已构成生命威胁的犯罪现场，有用的司法证据常常早就不见了。
A big problem is that forensic evidence is often lost in the life-threatening drama of the crime scene.
根本性的问题在于，哪些行为构成银行的“自营交易”，特别是因为这涉及到为客户利益而进行证券交易的行为。
At root is the issue of just what constitutes "proprietary trading" by Banks, especially as it relates to the issue of making trades in securities on behalf of their customers.
而地球向太空所辐射的能量多少，则在于大气层中空气成分构成，尤其是温室气体的含量大小。
The amount of energy emitted by the Earth depends significantly on the chemical composition of the atmosphere, particularly the amount of heat-trapping greenhouse gases.
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