rudimentary character ; vestigial character
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结论：LW -特效灭蟑乳油物理性状稳定，使用方便，施药时气味低、痕迹小，有广泛的应用前景。
Conclusion: Physical property of LW-special efficacy insecticide against cockroach is steady. It is convenient in use AD it has little smell and mark.
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