义词
;1977年
前只发现13个亚种，而且这些亚种都只对鳞
目害虫有效。
Until 1977, only 13 Bt subspecies had been described; all were toxic to lepidopteran larvae only.
的1977年前只发现13个亚种，而且这些亚种都只对鳞目害虫有效。
Until 1977, only 13 Bt subspecies had been described; all were toxic to lepidopteran larvae only.
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