To make clean straight folds in cardboard, first make a crease along the line with a blunt edge such as a spoon handle, then fold against a firm straight edge.

为了使清洁直纸板折叠，先如勺子处理沿钝边行折痕，然后对折直边坚定。

The edge is as blunt as an old butter knife.

刃钝得跟一把老黄油刀一样。

No doubt it is the fate of all cutting-edge technology to eventually turn blunt, dull and outmoded, but that is a concern for another day, another era.

毫无疑问，所有尖端科技最终都无法逃脱愚钝、沉闷和过时的命运，但那是在另一个时代另一个日子里才需要面对烦恼。

With its future on a knife-edge, GM delivered a blunt warning that unless its creditors accepted the plan, it would declare bankruptcy and leave the courts to carve up the company.

尽管前途险恶，通用汽车还是传达出了直白的警告：除非债权人接受这个计划，否则公司将宣布破产，并将公司交给法院瓜分。

If you cut the iron wire with a knife, you'll blunt its edge.

如果你用刀砍铁丝，会使刀锋变钝的。