Because it was backed with nothing.
因为它没有什么作后盾。
PBL education must be backed with high quality education resources.
构建优质教学资源是PBL教学的保障；
Most of the lawmakers who met with the president yesterday said they backed the mission.
大多数昨天与总统会面的立法委员们说他们支持这项使命。
The advice is practical and backed up with real world examples.
这些建议既实用又附有真实案例。
I backed up and went the other direction, to be honest with you.
诚实地说我换方向退后了。
He backed out of the room with subdued anger.
他强压怒火走出房间。
At the last minute, John backed out and refused to go with us.
约翰在最后一分钟食言，不和我们一起去。
At the last minute he backed out and refused to go with me.
在最后一刻他食言了，不愿和我一起去。
The headmaster backed up his argument with more facts.
校长以更多的事实来支持他的主张。
The headmaster backed up his argument with more facts.
校长以更多的事实来支持他的主张。
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