1. Coccoliths are microscopic plates of calcium carbonate produced by some types of algae.
（骨小片是由某些类型的藻类产生的微小钙碳酸盐板。）

2. The coccoliths found in sedimentary rocks provide valuable information about past climate conditions.
（在沉积岩中找到的骨小片提供了有关过去气候条件的宝贵信息。）