back board

基本解释

The back board is provided with a pin connected electrically with the ground wire.
背板具有引脚，该引脚与接地线电性连接。
ip.com
Secondly, it indicates that the back board has the great influence on the sound field and it needs to consider the factor of the back board fully when designing the dome.
背板材料对导流罩内部声场的平稳程度影响较大，在导流罩设计时应予以充分考虑。
The utility model is characterized in that one concave side of the back board is provided with two elastic bands.
其特征是背板凹进去的一侧安有两根松紧带。
ip.com

That's the finger thing from left finger to right finger going back and forth across the board, never touching a number more than once.
在合并时，我的左手手指,和右手手指来回地在黑板上移动，但对每个数字只会碰到一次。
哈佛公开课 - 计算机科学课程节选
I already said, back here, when I used this board, that this idea was really important.
我们设置下场景，我已经说了，回到这里，当我用这块黑板的时候。
麻省理工公开课 - 计算机科学及编程导论课程节选
And then they have to come back to the board meeting and report what they've learned.
之后，他们必须回到董事会上,报告他们所了解到的情况。
斯坦福公开课 - 戴尔CEO-Michael.Dell谈创业和发展课程节选

The NHL desperately needs to get those 30% of people back on board to keep the momentum going.
FORBES: NHL Lockout Is Over, But Will The Fans Come Back?