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四つん這い， 四つんばい， よつんばい
1. crawling on all fours, being on all fours, being on one's hands and knees
tbd
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くぐり抜ける， 潜り抜ける， くぐりぬける
1. to go through, to pass through
2. to struggle through, to get through (difficulties, danger, etc.), to escape (through the cordon), to evade (the law)
艰难地挣扎过去(例如从地震的废墟中爬出)，克服（困难、危险等），逃脱（封锁线），逃避（法律）；穿过，经过
は
1. indicates sentence topic
2. indicates contrast with another option (stated or unstated)
3. adds emphasis
指示句子的主题；表示与另一选项（无论是否明确提及）形成对比；表示强调
