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飛び乗る， 跳び乗る， とびのる
1. to jump on (a horse), to jump onto (a bus, train, etc.), to jump into (a taxi)
跳上(马)，跳上(公共汽车、火车等)，跳上(出租车)
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
