The use of herbicides and intensive forms of agriculture means that fields of wheat and barley now have few weeds.

除草剂的使用和集约型农业使得现在小麦和大麦麦田里几乎没有杂草。

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Later, they learned to work with the seasons, planting at the right time and, in dry areas, making use of annual floods to irrigate their fields.

后来，他们学会了按季节耕作，适时播种，以及在干旱地区利用每年的洪水来灌溉他们的农田。

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Because the meaning of a formal topic should never vary based on its use, these fields should be part of the topic.

因为正式题目的含义不会根据它的使用变来变去，所以这些字段应当成为题目的一部分。

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Today, the system is used in therapy and education, and can have a strong spiritual dimension -- but one of the first and major fields of use is business, where it has been adapted as a way of bringing insight into oneself and others.

CNN: STORY HIGHLIGHTS

By knowing the size and shape of their fields, farmers can then use correct amounts of fertilizer and plan for future soil improvements. eDairy in Sri Lanka also allows farmers to send text messages to a network of veterinarians and extension workers requesting services.

FORBES: The Untapped Potential of the Mobile Phone

Eradication teams in Colombia talk of finding high-density coca fields in new areas, and more use of fertiliser by growers.

ECONOMIST: Coca and cocaine in the Andes