不同类型的颗粒-包括显微藻类，其他浮游生物和周边陆地地区的腐殖质-不断沉积在湖底。
Particles of different kinds - including microscopic algae, other plankton and humus from surrounding land areas - are continuously deposited on lake bottoms.
萨曼塔·普莱斯：蓝鲸可能是有史以来最大的哺乳动物，它们的猎物——磷虾及浮游生物——体型却非常微小，几乎用显微镜才能看见。
Samantha Price: The blue whale which is –we think –is probably the largest ever living mammal… eats these tiny, almost microscopic krill and plankton.
在一个船上实验室，莫斯·兰丁海洋实验室的Julie Kuo正通过显微镜观察一只砂壳虫——一种微小的、圆锥形的浮游生物。
In a lab on the ship, Julie Kuo of Moss Landing Marine Labs looks through a microscope at a tintinnid - a tiny, cone-shaped plankton.
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