Countless choices define our fate, each choice, each moment, a ripple in a river of time.

无数的选择决定了我们的命运。每一次选择，每一个时刻，都是时间河流中的一个涟漪。

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The present is neither a point nor a plane but it is a pontoon bridge resting upon a river of time.

现在既不是一个时间点又不是一个时间段面，它是跨越于时间长河之上的一座浮桥。

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At the time of the floods, the river and lake were at the same level and connected through a gap in the hills near the modern villages of el-Lahun and Hawara.

洪水来临时，湖和河在同一水平面上，并且通过艾尔拉罕和哈瓦拉现代村庄附近山脉的一个裂口连接起来。

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Images of these rivers were compared with a model developed by Perron of how a river network evolves over time.

MSN: Saturn's moon Titan may have seen Earth-like erosion

Already their numbers have been decimated by marriage and migration. (Some 40, 000 Macanese now live abroad.) They and their once-graceful port at the mouth of the Pearl River will have a hard time maintaining a distinct identity under mainland rule.

CNN: ASIANOW - TIME Asia

If teens are swimming in a natural body of water like a lake or river, they should use the rule "feet first, first time" to prevent spinal injuries.

CNN: Water safety expert: 'Drowning doesn't just happen'