《明史·列传·卷一百六十二》
不久，黄河防线上传来警报。
顷之，河上告警。
Soon afterwards a warning reached him from the Huaihe River defences.
<s>[INST] Highlight and translate the key terms in the Classical Chinese text: 顷之，河上告警。, and explain their significance in the context of the passage. [/INST]
Key terms and their translations:
顷之 qǐngzhī: Soon afterwards
河上 héshàng: Huaihe River defences
告警 gàojǐng: warning

Final English translation: Soon afterwards a warning reached him from the Huaihe River defences.

Significance of the key terms:
The terms 顷之, 河上, and 告警 are crucial in understanding the context of the passage. 顷之 indicates the time frame of the events, implying that the warning was received shortly after a certain action or event. 河上 refers to the Huaihe River defences, which were strategically important in ancient China. Finally, 告警 conveys the urgency and seriousness of the situation, as it pertains to a warning of impending danger or attack.</s>
Highlight and translate the key terms in the Classical Chinese text: 顷之，河上告警。, and explain their significance in the context of the passage.
user
Key terms and their translations:
顷之 qǐngzhī: Soon afterwards
河上 héshàng: Huaihe River defences
告警 gàojǐng: warning

Final English translation: Soon afterwards a warning reached him from the Huaihe River defences.

Significance of the key terms:
The terms 顷之, 河上, and 告警 are crucial in understanding the context of the passage. 顷之 indicates the time frame of the events, implying that the warning was received shortly after a certain action or event. 河上 refers to the Huaihe River defences, which were strategically important in ancient China. Finally, 告警 conveys the urgency and seriousness of the situation, as it pertains to a warning of impending danger or attack.
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