- backward and bidirectional
- 反向: opposite direction; reverse; ...
- 与: take part in; participate in
- 双向: two-way
- 的: 4次方是 The fourth power of 2 i ...
- 双向的: amphichdiral; biaxial; bidirectional (both-way); bilateral; bipartite; bipolar; doubleacting; duo directional; duplex; ovonic; two way; two-way
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