tri-level sync 三极同步 ; 三电平同步
bottom-level sync 选项与底层同步
sync signal level 同步信号电平
sync level 同步电平
sync tip level 同步脉冲幅度
As part of the video signal, bi-level sync introduces an unwanted DC component (Figure 2).
作为视频信号的一部分，双电平同步包含了一部分并不需要的直流分量(如图2)。
The browser and server state remain in sync, and you never have to deal with the low-level API that facilitates their communication.
浏览器和服务器状态保持同步，而且永远无需处理促成它们之间通信的低层api。
The easiest way to understand HADR is as a pair of servers that are kept in sync with each other at the database level.
理解 HADR 最容易的方法是设想两台服务器，它们在数据库级保持相互同步。
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