切除声带并不是必要的手术，克拉苏纳医生说。
"Debarking is not a medically necessary procedure," Dr. Klausner said.
依奇克里克原油的煤系成分大于克拉苏构造带原油。
The natural gas in Ke-Yi tectonic belt is from coal measures.
克拉苏斯基说，在一些情况下，我们可能对“越低越好”的概念过于热心了。
'In some cases, we might have become overzealous' with the lower-is-better idea, Dr.
克拉苏斯基说，在一些情况下，我们可能对“越低越好”的概念过于热心了。
'In some cases, we might have become overzealous' with the lower-is-better idea, Dr.
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