词
虫;
;1977年以前只发现13个
，而且这些
只对鳞翅目害虫有效。
Until 1977, only 13 Bt subspecies had been described; all were toxic to lepidopteran larvae only.
1977年以前只发现13个，而且这些只对鳞翅目害虫有效。
Until 1977, only 13 Bt subspecies had been described; all were toxic to lepidopteran larvae only.
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