Of course he spoke with a conventional sense of duty only, for that sort of wondering had not been unknown to himself in bygone days.
当然，他说这话的时候，是出于一种习惯的责任感，因为在过去他自己也不是没有产生过这样的疑问。
2
The limitation of the conventional design of the heavy duty ingot mold has been analyzed in this article.
分析了传统设计在大型钢锭模上的局限性，为采用计算机设计大型钢锭模提出新的思路。
3
The research indicates that the conventional pavement technique can only be suitable for the normal pavement design but not for the heavy-duty pavements.