它的象征意义可能来自于橄榄树需要很长时间才能结出果实，所以橄榄只能在长久的和平时期才能被成功种植。

The symbolism may come from the fact that the olive tree takes a long time to produce fruit, so olives could only be cultivated successfully in long periods of peace.

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我选了一棵结实的树，并花了几个星期的时间把它砍倒。

I chose a strong tree and spent weeks cutting it down.

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要想长得高大，一棵树需要具备三个条件：合适的育苗地点、良好的生长条件和大量低成虫死亡率的时间。

To achieve giant stature, a tree needs three things: the right place to establish its seedling, good growing conditions and lots of time with low adult mortality.

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