Scientists continue to push back the boundaries of human knowledge.
科学家不断扩大人类知识的范围。
But we have ways to push back.
但我们也有反击的手段。
The firm wanted to push back the deadline but was refused.
公司想推迟截止日期，但遭到了拒绝。
Two new projects, however, aim to push back both these limits.
所幸的是，两个新项目正在努力打破这些限制。
Two new projects, however, aim to push back both these limits.
所幸的是，两个新项目正在努力打破这些限制。
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