They drove the caterpillar tractors to any place that needed their help.

他们驾驶关履带拖拉机到任何需要帮助的地方。

Soon, two enormous caterpillar tractors with mechanical shovels on their front ends came clanking into the wood.

很快，两台前端装有机械铲子的巨大履带式拖拉机叮当作响地驶入树林。