关头的用法和样例：
例句
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"这就是那些历史关头之一，" 罗杰说： "这关头也许会改变历史的进程。"
"This is one of those moments, " Roger said, "which might change the course of history." -
她在危急关头总是挺身而出。
She's always to the fore at moments of crisis. -
现在到了紧要关头。
We have come to the critical moment. -
现在企业的改革正处在紧要关头。
The reforms of enterprises are now at the critical moment.
