1·The uranium deposits are obscured by sand, peat and glacial drift.
铀矿床被砂子，泥炭和冰碛物所覆盖。
2·One of a series of short scars made by glacial DRIFT on a surface of bedrock.
冰川漂流物在基岩表面留下的一系列短痕之一。
3·As geologists mapped glacial deposits in the late nineteenth century, they became aware that there were several layers of drift, the lower ones corresponding to earlier ice ages.