其中数据总线sda是一个双向引脚，用于输入或输出数据。
Which the data bus SDA is a bidirectional pin used for input or output data.
由输入连接和输出连接组成的一种双向通路，两个连接都有同一交换机接口。
A bi - directional path comprised of an input connection and an output connection, both having the same exchange interface.
焊接初级回路采用双向水冷可控硅控制，保证电流输出平衡，可靠。
Welding primary windings adopts two-way water-cooled silicon-controlled rectifier control, ensure that current output balance, and reliable.
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