Several days past uncertain weather, rainy & sometimes hot.
这几天忽冷忽热，阴晴不定。
At this altitude, the air is very thin and the weather is uncertain. So the climbing is very difficult.
在这样高度上，空气十分稀薄，气候变幻无常，因此攀登非常困难。
The dependence of the crops on the weather makes farming very uncertain .
收成视天气而定，使农业没有把握。
The dependence of the crops on the weather makes farming very uncertain .
收成视天气而定，使农业没有把握。
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