a white soft earthy limestone (calcium carbonate) formed from the skeletal remains of sea creatures
白垩。
a similar substance (calcium sulphate), made into white or coloured sticks used for drawing or writing
（硫酸钙制成的）粉笔。
[count noun]
【地质】 白垩地层。
short for
draw or write with chalk
用粉笔画（或写）。
draw or write on (a surface) with chalk
用粉笔画（或写）于（表面）。
rub (something, especially a snooker cue) with chalk
用白垩粉擦（桌球杆等）。
〈英〉 把（酒钱）记于（某人）账上。
-
as different as （或like ）chalk and cheese Brit . fundamentally different or incompatible 〈英〉 截然不同的；毫不相容的 -
by a long chalk Brit . by far 〈英〉 …得多；最 -
chalk and talk Brit . teaching by traditional methods focusing on the blackboard and presentation by the teacher as opposed to more informal or interactive methods 〈英〉 使用黑板板书和老师主讲的传统教学法 -
not by a long chalk Brit . by no means; not at all 〈英〉 决不；一点也不 -
［ORIGIN with reference to the chalk used for marking up scores in competitive games．］
-
chalk something out sketch or plan 粗略地计划；规划 -
chalk something up 1 draw or write something with chalk 用粉笔画（或写）2 achieve something noteworthy 取得，达到he has chalked up a box office success . 他取得了票房成功 -
3 ascribe something to a particular cause 把… 归于I chalked my sleeplessness up to nerves. 我把失眠归于神经紧张
"Old English
