它既可以指证明争议事实（a factin issue）的义务，也可以指证明 证据事实（evidential facts）的义务。
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Material of the Evidential Facts 证据事实质料
It is obvious, over the facts of case, that Conclusion of Lie Detecting carries weight with proof. But it did not get its legality for proof in China so that it could not have the evidential function.
测谎结论对案件事实具有明显的证明作用而具有证明力，但在我国因法律没有明确赋予其合法性而不具证明能力。
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