The problem is that it is pretty difficult to ensure and test.
问题是，对此的保证和测试是非常困难的。
It is difficult to ensure quality when welding different materials.
异种材料焊接时焊接质量较难保证。
As a result, it's difficult to gauge progress, and impossible to ensure information completeness.
因此难以衡量进度，也不能保证信息的完整性。
As a result, it's difficult to gauge progress, and impossible to ensure information completeness.
因此难以衡量进度，也不能保证信息的完整性。
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