踪迹: tracks, trail, footprint, trace, vestige...
过去: go over; pass by...
首先: first (of all), in the first place...
贡献: to contribute, to dedicate, to devote, contribution...
客人: visitor, guest, customer, client...
丢弃: to discard, to abandon...
交朋友: to make friends, (dialect) to start an affair with sb...
碰钉子: to meet with a rebuff...
熟: cooked (of food), ripe (of fruit), mature (of seeds), familiar, skilled, done, also pr....
吵: to quarrel, to make a noise, noisy, to disturb by making a noise...
