问题回到原态
前功尽弃，重新开始

We are back to square one now.
我们正在重新设计。

I am back to square one.
我得从头开始写。

Our design for a solar-powered washing machine didn\'t work, so it\'s back to square one.
我们的太阳能洗衣机设计方案失败，所有的一切都要重新开始。

be back to square one with one's back to the wall square one's shoulders back-to-back back to back at one's back get one's own back behind one's back turn one's back on turn one's back upon be on one's back to cast sth behind one's back with one's back to the wall to put one's back into sth back square to talk through the back of one's neck back-to-back testing back-to-back circuit back to back diodes back-to-back test back-to-back starting back-to back credit