His face darkened with some powerful emotion, which, nevertheless, he so instantaneously controlled by an effort of his will, that, save at a single moment, its expression might have passed for calmness.

• 他的脸色由于某种强有力的内心冲动而变得阴暗，不过他人刻用一种意志力控制住，使这种脸色稍纵即逝，换上了一副可以说是平静的表情。