这些动词都表示基于不确定证据而作出结论或推断。
These verbs mean to reach a conclusion or judgment on the basis of uncertain evidence.
另外，已有确定证据表明，从未生育过的女性罹患各种癌症的风险本来就很高，因此研究者如何从其中分离出生育药物同癌症发生之间的关系，困难重重。
It is also well known that women who never give birth are at greater risk of various cancers; studies had trouble untangling that effect from any connection to fertility drugs.
由于这些优点，可以通过辐射测量方法以足够确定沉积证据的年代，从而建立一个精确的冰河时代年表。
Because of these advantages, sedimentary evidence can be dated with sufficient accuracy by radiometric methods to establish a precise chronology of the ice ages.
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