前两种
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former two species
以上为机器翻译结果，长、整句建议使用 人工翻译 。
Two species of snails, namely, Tricula fujiansis and Semisulcospira libertina were found, but only the former was the first intermediate host. The infection rate of snails was 0.7%(4/569).
全县发现福建拟钉螺和放逸短沟蜷两种螺蛳，只有前者为斯氏狸殖吸虫和泡囊狸殖吸虫的第一中间宿主，其感染率为0 7% （4/ 5 6 9）。
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