They have an extra heavy burden to bear.
他们需要背负更重的担子。
However carpet comes in two basic grades - heavy and extra heavy duty.
这是因为地毯有两种基本的等级-厚型或者加厚地毯。
Does the luggage you take on vacation feel extra heavy these days?
这些日子外出度假有没有感觉行李特别沉？
The reservoir belongs to the huge massive block extra heavy oil reservoir.
油藏类型为巨厚块状特稠油油藏。
Extra heavy duty aluminum stair treads available upon request.
特重型铝楼梯板要求提供。
Heavy-duty wire bails offer extra durability for heavy use.
重型丝保释提供额外的耐用性，为大量使用。
Heavy-duty wire bails offer extra durability for heavy use.
重型丝保释提供额外的耐用性，为大量使用。
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