關頭的用法和樣例：
例句
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"這就是那些歷史關頭之一，" 羅傑說： "這關頭也許會改變歷史的進程。"
"This is one of those moments, " Roger said, "which might change the course of history." -
她在危急關頭總是挺身而出。
She's always to the fore at moments of crisis. -
現在到了緊要關頭。
We have come to the critical moment. -
現在企業的改革正處在緊要關頭。
The reforms of enterprises are now at the critical moment.
