对于实际生产中的每一次设计来说，这些条件是有差异的。
These conditions are different in different design of practical produce.
经过四年的生产实际考验，这种输送方式在特定条件下是有推广价值的。
Through four years practical application, this transfer scheme is successful and worthful in certain condition.
经过四年的生产实际考验，这种输送方式在特定条件下是有推广价值的。
Through four years practical application, this transfer scheme is successful and worthful in certain condition.
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