介绍:
Day92.
Stone does not decay, and so tools of long ago have remained when even the bones of the man who made them have disappeared without trace.
石头不会腐烂，所以以前的(石器)工具能保存下来，虽然它们的制造者已经消失的无影无踪。
Decay 美 [dɪˈkeɪ] v衰败，衰退，衰落; n.腐败、衰退的状态
Popular cinema seems to have decayed
大众电影似乎已经衰落了。
The bodies buried in the fine ash slowly decayed
埋在灰烬里的尸体慢慢地腐烂了。
trace 美 [treis]
vt.跟踪，追踪;追溯，探索;探索;查找
vi.沿着一小径或道路前进;可以追溯的
n.痕迹;痕迹，踪迹;微量，极少量;[植]（脉）迹
Wash them in cold water to remove all traces of sand
用冷水冲洗它们以清除所有的沙子。
Throughout, he showed no trace of self-pity.
他从始至终都没有表现出一丝的自怜。
