其机理和意义有待进一步探讨。
但在某些参数下杀菌效果出现反弹现象，其原因有待进一步探讨。
However, under some parameters, the rebound phenomena of bactericidal effect appear, which requires in depth discussion.
但五种中草药对枯草杆菌均无杀菌效果，其原因有待进一步探讨。
But there was no fungicidal effect on Bacillus subtilis and the reason need deep-seated discussion.
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