They may also have used wood and skins, but these have rotted away.
他们也可能用过木头和兽皮，但这类东西早已腐烂殆尽。
新概念英语第四册
Lesson 1 Finding fossil man
📚 句中词汇解析
从本句中提取的重要词汇
adv. 离开，远离;在远处;消失;
adj. 不在的;遥远的;客场比赛;
💡 a(on)+broad→在远方；离去；不在
"In the hotel, the old men were drinking away as usual."
在旅馆里, 这些老人和往常一样喝个不停.
近义：abroad, out, outdoors, outside, without
adj. 用过的;习惯于;二手的;旧的;
v. 使用（ use的过去式和过去分词）;常常，经常;
"Things ain't what they used to be."
现在情况不比从前了。
近义：outworn, worn, utilized, wonted, accustomed
反义：unused, unworn
n. 木材;树林;木制品;
vi. 收集木材;
vt. 在…植树造林;给…添加木柴;
adj. 木制的;失去理智的;
"Wood is a poor conductor."
木头不是良好的导体。
近义：lumber, timber, fuelwood, firewood, wooden