1. The mammoth fell into an ice crevasse.
    猛犸掉进冰河裂缝里了.

2. As by falling into inaccessible caves, or into an ice crevasse,
    如掉进难以到达的洞穴，或掉进冰河裂缝里，

3. In his mouth were the remains of fir trees----the last meal that he had before he fell into the crevasse and broke his back.
    它嘴里还留着冷杉 -- 它掉进冰河裂隙折断脊椎柱之前的最后一顿饭。