Signals are the efficient and flexibleglue that tie the objects in your program together.
信号是一种有效和灵活的“粘合剂”，它们把程序中的对象“粘合”在一起。
2
Helping developers split applications into a collection of loosely-coupled, highly-cohesive pieces, and then glue them back together in a flexible manner.
它有助于开发人员将应用程序拆分为松耦合、高内聚的功能片断的集合，然后以灵活的方式将它们粘连在一起。
3
Seawater, however, is alkaline. This alkalinity causes the glue to set. It solidifies into a foam within 30 seconds and becomes a flexible, leathery substance over the course of several hours.