Join your local trail maintenance group and help combat trail erosion.

加入当地的步道维护小组，并帮助打击步道侵蚀。

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Clone combat engineers would blaze a stable trail over unsteady terrain and construct a makeshift bridge that would accommodate the heavier walkers further down the battle line.

克隆人工兵可以在不稳定地形上开辟一条稳定的小路，架设一座临时桥以供较重的步行机继续开赴前线。

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After spending almost two years parrying these attacks from Democrats in Congress and in his numerous TV news-show appearances, Mr. Ryan appears well prepared to combat this criticism on the campaign trail.

WSJ: Mitt Romney Picks Paul Ryan as Vice Presidential Running Mate