基本解释[机械工程]履带式开土机英汉例句双语例句The jaws of the bucket opened; the bulldozer retreated on its caterpillar treads and almost flipped over as it was suddenly lightened of its load.铲车上下颌张开，踩着履带后退。它是如此轻快的后退着好像突然卸去了重负。caterpillar bulldozer更多例句专业释义机械工程履带式开土机