第三人称单数:marks off 现在分词:marking off 过去式:marked off
1.(用线条,符号等)划分,区分
2.同“mark down ”
1.to mark the limits of an area using a line, fence, rope, etc.
2.to mark something with a word, letter, or symbol in order to show that you have dealt with it
3.Same as mark down