Spontaneous fallow vegetation can also be counted as a crop rotation element.

Crop rotation makes a balanced demand on the fertility of the soil.

轮作可以平衡对土壤的肥力要求.

He grew a different crop on the same field five years in a row, what researchers call crop rotation.

他连续5年在同一块地里种植不同的作物，研究人员称之为轮作。

Crop rotation helps prevent soil erosion.

农作物轮作有助于防止水土流失.

Intriguingly, similar ideas crop up in mainstream theories.

有趣的是, 类似的想法在主流理论之中已有斩获.

Tensions crop up too between the short term and long term.

在短期与长期利益之间,也出现了紧张局面.

Similar problems may crop up in our future work.

在我们的工作中,今后还可能出现类似的问题.

As in the past, surprises will crop up-pleasant and unpleasant ones.

就如以往一般, 会有突然的惊奇 —— 好的坏的都有.

In financial history they crop up time after time.

它们都是些深刻的原因.

Gradually, all kinds of little problems begin to crop up.

渐渐地, 各种各样的小问题开始出现.

Of course new problems will crop up and have to be tackled.

当然也还有新问题,还需要继续解决.

For one thing, annoying technical glitches sometime crop up.

首先, 有时发生让人烦恼的技术故障.

Prooblems usually crop up and hit you before you are ready.

问题常常会出乎意料地出现,在你没准备的情况下袭击你.

All the chief difficulties crop up in the synthesis of the enone ( 1 ).

所有的主要难点都涌现在烯酮 ( 1 ) 的合成中.

It's silly to paper over the problem; it will only crop up again one day.

把这个问题掩盖起来的作法是愚蠢的, 总有一天还会暴露的.

Keep calm when problems crop up.

遇事冷静.

Misprints often crop up in the papers.

报上常出现印刷错误.

Problems will crop up and hit you before you are ready.

你还未准备好，问题就会突然出现并打击你。

This change starts with the 2009 crop year.

该调整将从2009作物年度开始实施.

Implementation of the appropriate yield-protection factors insures that the maximum crop yield is harvested.

恰当的产量保护措施能保证我们收获最高产量.

Our result could potentially be used to increase crop yield and efficiency of land usage.

我们的研究将为提高作物产量,增加土地利用率提供理论依据.