Concerning exposures to specific chemicals, tetrachloroethylene is identified as the most commonly used solvent during the last two to three decades.
关于风险的具体化学品，四氯乙烯是被确定为最常用的溶剂，在过去两至三数十年。
The muck is removed regularly (commonly once per day) and then processed to recover solvent trapped in the muck.
该淤泥移除定期(每天)，然后再处理，以收回溶剂被困在了淤泥。
This medium is an alternative to the co-solvent system commonly used in enzymatic peptide synthesis and may find applications in dealing with hydrophilic peptides and unstable enzymes.
这一方法为肽键的酶促合成提供了一条新的途径，在亲水性多肽的酶促合成方面具有应用可能性。
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