Meanwhile, Syria has dismissed as abarefacedlie, allegations from Britain and the US that it may have used chemical weapons in its fight against rebels.
英国和美国称叙利亚可能使用化学武器来对付叛军，叙利亚称这种说法是无耻的谎言。
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So Rob is a 'barefaced liar' because he's obviously telling alie without any embarrassment.