This Hornbook provides an overview of the history and traditions underlying today's admiralty and maritime law.

本书是关于海事法历史与传统初级读本。

Ferns were the first terricolous vascular plants, and still comprise an important part of primary productivity of ecosystems.

蕨类是最早登陆维，至今仍然是生态系统初级生产力重要组成部分。

First, the precursor of chromatoid body adhered to the inner surface of the nuclear envelope.The nuclear envelope where the chromatoid body adhering was destroyed.

在初级精原细胞细胞核中，拟染色体前体质先附著于核膜内侧，该处核膜崩溃。

By chiseling a BOL on a surface of a lens, a apochromatic system is composed, which actualizes the system's apochromatism, as well as revising primary aberration.

并将学面刻画在透镜表面，在校正系统初级像差同时，实现了系统复消色差。