outsole

基本解釋

When you can see white midsole material poking through the outsole or when the sole under the heel looks crushed, the shoes are long past their prime.
當你看到白色的中底材料已經穿透大底，或者腳跟處的大底看起來已經裂了，那么這雙鞋早就壽終正寢了。
If the upper appears pulled or stretched so that the foot is sliding off the midsole, or the grooves on the outsole are worn smooth, it's time for new running shoes.
如果上面的網布看起來呈拉伸或者撐起來的樣子，那就說明腳在中底上打滑了，或者大底的花紋已經磨光了，就該買新跑鞋了。
You should wear trail shoes if you are a runner who frequently runs off-road, and are looking for rugged shoes with great outsole traction and some weather- and water-resistant qualities.
如果你經常在野外活動，需要鞋底有良好的抓地性能，并能應對惡劣天氣以及防水，那么你應該選擇健行鞋。