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1. President Joe Biden held his first news conference of his administration Thursday and pushed back against suggestions his administration is responsible for a surge of immigrants at the border.
push back 推拒，抵制（变革、批评等）
Find the bright side in bad situations, and push back against negative opinions.
在不好的情况下找到好的一面,并抵制消极的观点。
2. The president says it has nothing to do with him being a nice guy and rolling back harsh Trump administration actions.
roll back 逐渐减少;逐步结束
Environmentalists regard these moves as the government taking advantage of the national mood to roll back protective measures
环保主义者认为这些是政府利用国民情绪来减少保护措施的举措。
