too far behind to catch up with
落后太多，追不上了
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Occasionally, however, if we fell too far behind his mother, he would give me a slight shove with his trunk as a gentle inducement to catch up.
FORBES: Paul Allen's Revitalized Abu Camp in Botswana
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