The most effective way is lower frequency tapping, as other ways may cause production decrease or need high cost or be re strained by environment or require great Labour intensity.
因为其它方法存在较大缺陷，有的造成减产，有的成本高，有的受环境制约，有的劳动强度太大等。
The most effective way is lower frequency tapping, as other ways may cause production decrease or need high cost or be re strained by environment or require great Labour intensity.
因为其它方法存在较大缺陷，有的造成减产，有的成本高，有的受环境制约，有的劳动强度太大等。
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