1) It is not sharp enough.
这把刀不够快。
2) This knife won't cut.
这把刀不快.
3) The scissors aren't sharp.
这把剪刀不快。
4) This knife is very sharp.
这把刀很快。
5) Please sharpen the edge of this knife.
请把这刀刃磨快。
6) This knife cuts badly.
这把小刀不好使。
参考词条