Then, four days from the end, one of the 40-micron meshes in each mesocosm was rotated to sever any hyphae that had penetrated it, and the central plant was then infested with aphids.

到了实验结束前四天，研究人员在每个生态系统中都旋转了一个40微米网筛，切断了所有穿过筛孔的真菌菌丝，不久位于中央的那株蚕豆就受到了大批蚜虫的侵扰。