flocculonodule

例句：

1. 1. The water in the lake was so clear that you could see the flocculonodules floating on the surface.
   湖里的水非常清澈，可以看到浮在水面上的浮游生物团块。
2. 2. The scientist observed the flocculonodules in the river and noted their different sizesand shapes.
   科学家观察了河流中的浮游生物团块，并注意到它们的大小和形状各不相同。
3. 3. The flocculonodules were a sign of the ecosystem's health, as they indicated the presence of beneficial bacteria.
   浮游生物团块是生态系统健康的标志，因为它们表明存在有益的细菌。