一个男孩正坐在树下，背靠着树，在吹一根粗糙的木笛。
A boy was sitting under a tree, with his back against it, playing on a rough wooden pipe.
木霉在筛选试验中对索氏根霉菌表现出较强的拮抗作用。
Trichoderma spp. showed strong antagonistic action against Rhizoctonia solani in screening tests.
削木需要非常精准和平滑，甚至一根头发丝的缝隙都不能有。
The cutting should be so precise and smooth that even a thread of hair cannot slip through the cracks.
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