1. The sandbank was uncertain, like quicksand under his feet. 这个沙丘不结实,像他脚下的流沙一样。
2. On occasion, animals and plants have been preserved after becoming immersed in tar or quicksand, trapped in ice or lava flows, or engulfed by rapid falls of volcanic ash. 有时,动物和植物被浸泡在焦油或流沙中,被困在冰或熔岩流中,或被迅速落下的火山灰吞没后被保存下来。
3. The research seemed founded on quicksand. 该研究仿佛建立在一盘散沙基础上的。