scavenge
/ˈskævɪndʒ/verb
with obj.
1- search for and collect (anything usable) from discarded waste从废弃物中捡拾（有用的东西）：
people sell junk scavenged from the garbage
人们出售从垃圾中捡来的废旧物
no obj. the city dump where the squatters scavenge to survive.许多人蹲在那里靠捡破烂为生的城市垃圾堆。
1.1
- (of an animal) search for (carrion) as food（动物）觅食（腐肉）。
1.2
- search for discarded items or food in (a place)在…搜寻物品（或食物）：
the mink is still commonly seen scavenging the beaches of California.
仍可经常看到貂在加利福尼亚海滩上觅食。
1.3
- remove (combustion products) from an internal-combustion engine cylinder on the return stroke of the piston（从内燃机汽缸里）扫（气）。
1.4
- Chemistry combine with and remove (molecules, radicals, etc.) from a particular medium【化】（通过化合作用从特定介质中）清除（分子、原子团等）。
词源
mid 17th cent. （in the sense 'clean out (dirt)'）： back-formation from SCAVENGER.