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If it is necessary to draw the attention of other ships, any ship may emit a light or sound signal, provided that such signal shall not be mistaken for any signal permitted by other provisions of these Rules, or the beam of the searchlight shall be directed in a dangerous direction in a manner that will not interfere with any ship. Any light that draws the attention of other ships should not be mistaken for the light of any navigation aid sign. For this purpose, the use of high brightness intermittent or rotating lamps such as stroboscopic lamps should be avoided.这一刻萧月婷终于笑了起来。Human's classification consciousness and practice on vegetation, animals and other organisms have existed since ancient times. They existed in ancient China and ancient Greece, and developed into a science-taxonomy. However, the early classification was mainly based on morphology, such as the shape of roots, stems and leaves. Taxonomy based on morphology is the oldest discipline in biology, and the earliest phyla, classes, orders, families, genera and species basically came from here. Taxonomy in the general sense refers to a specialized discipline that identifies, identifies, describes, names and classifies organisms. The task and purpose of taxonomy can be divided into two parts:你可好些了？那女子无力地摇头，闭上眼睛，似乎陷入沉睡。A3.1. Head and neck examination.