Calculus is the part of mathematics that deals with changing quantities — for example, how fast a stone is falling at one moment, or how steep a curved line is at one point. School calculus usually comes in two big pieces: one about rates and slopes (differential calculus), and one about adding up tiny bits, like the area under a curve. It is a senior-school and university word.

Calculus is the part of mathematics that deals with changing quantitiesCalculus是數學裡處理變動量的那個部分for example, how fast a stone is falling at one moment例如一顆石頭在某一瞬間掉落的速度or how steep a curved line is at one point或是一條曲線在某一點的陡峭程度School calculus usually comes in two big pieces學校教的calculus通常分成兩大部分one about rates and slopes (differential calculus)一個是關於變化率和斜率（微分）and one about adding up tiny bits, like the area under a curve另一個是關於把微小的部分加總起來，像是曲線下的面積（積分）It is a senior-school and university word這是高中和大學程度的字

The name comes from a Latin pebble: people once moved little stones to count, and later the word moved into high maths.

The name comes from a Latin pebble這個名字來自拉丁文的小石頭people once moved little stones to count人們以前會移動小石頭來計數and later the word moved into high maths後來這個字就進入了高等數學

Though actually, doctors also use calculus for a hard stone in the body, such as on teeth; that is the old “pebble” meaning, not your maths class. This entry is the maths one.

Though actually不過其實doctors also use calculus for a hard stone in the body醫生也會用calculus指身體裡的結石such as on teeth像是牙齒上的that is the old "pebble" meaning那是舊的「小石頭」意思not your maths class不是你數學課學的那個This entry is the maths one這個條目講的是數學的那個意思