如果可能，应追查谣言的源头。If it's possible, track the rumour back to its origin.探险者在中非找到了尼罗河的几处源头.Explorers traced the Nile River to its several headstreams in Central Africa.我们溯河而上,直到源头.We traced the river to its source....
古代留下来的高架渠在蓝天的映衬之下十分夺目。The ancient aqueduct stood out against the clear sky.古罗马的大道和高架渠在其后的年代一直受到羡慕.The roads and aqueducts of Rome have been the admiration of all after ages....
Palpitation from frequent extrasystoles or other arrhythmia is common.来自频发的期前搏动或其他心律不齐的心悸亦属常见.This normal variation in rhythm is known as sinus arrhythmia.节律的这种正常变化称为窦性心律失常.The heart frequently exhibits ventricular arrhy...