用刀往下划英语怎么说

"To slash with a knife" is the English phrase that describes the action of using a knife to make a long, deep cut or wound. This phrase can be used to describe any situation where someone intentionally uses a knife to cut or wound something or someone.
One possible origin of this phrase is the fact that knives are often used as weapons, and one way to use a knife as a weapon is to slash or cut with it. Knives are also commonly used for cutting or slicing food or other materials, so the phrase "to slash with a knife" may also be used to describe this type of action.
Here are a few examples of the phrase "to slash with a knife" in context, along with their translations into Chinese:
"The robber threatened the store clerk with a knife, demanding that they give him all the money in the cash register. When the clerk refused, the robber slashed at them with the knife, causing a deep cut on their arm." (强盗用刀威胁商店店员，要求他们把所有现金放在收银机里。店员拒绝了，强盗用刀往他们划去，导致他们的胳膊上有一道深刻的伤口。)
"The chef used a sharp knife to slash the skin of the chicken, making it easier to remove the bones and prepare the meat for cooking." (厨师用一把锋利的刀往鸡皮划去，使得它更容易去除骨头，并准备烹饪。)
"The artist used a small, pointed knife to slash the canvas, creating a jagged, torn effect in the painting." (艺术家用一把小的尖刀往帆布划去，在画中创造出一种锯齿状的、被撕裂的效果。)