The gravel packing in casing is a effective method to prevent sand production.
套管内砾石充填防砂是一种行之有效的防砂方法。
It is an effective method of biological control to use insect virus to prevent pest.
利用昆虫病毒防治害虫是生物防治的一种有效方法。
It is an effective method of biological control to use insect virus to prevent pest.
利用昆虫病毒防治害虫是生物防治的一种有效方法。
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