老師，黑板上的函數不是指數函數，是三角函數。

Hey, sir, the function on the blackboard is not exponential, but trigonometric.

Source: Tatoeba

Sentence Composition

1 老師 lǎoshī teacher

classifiers: 個, 位
2 黑板 hēibǎn blackboard

classifiers: 塊, 個
=3 上 shǎng used in 上声 shǎngshēng
=3 上 shàng
  1. (bound form) up; upper; above; previous
  2. first (of multiple parts)
  3. to climb; to get onto; to go up
  4. to attend (class or university)
  5. (directional complement) up
  6. (noun suffix) on; above
=4 的 de
  1. of; ~'s (possessive particle)
  2. (used after an attribute when it modifies a noun)
  3. (used at the end of a declarative sentence for emphasis)
  4. (used after a noun, verb or adjective to form a nominal expression, as in 皮革的 pígéde "one made of leather" or 跑堂儿的 pǎotángrde "a waiter (literally, one who runs back and forth in a restaurant)" or 新的 xīnde "new one")
  5. also pr. dì or di in poetry and songs
=4 的 dī a taxi; a cab (abbr. for 的士 dīshì)
=4 的 dí really and truly
=4 的 dì (bound form) bull's-eye; target
5 函數 hánshù function (math.)
=6 不是 bùshì
  1. no
  2. is not
  3. not
=6 不是 bùshi fault; blame
7 指數函數 zhǐshùhánshù exponential function
=8 是 shì
  1. to be (followed by substantives only)
  2. correct; right; true
  3. (respectful acknowledgement of a command) very well
  4. (adverb for emphatic assertion)
=8 是 shì variant of 是 shì
9 三角函數 sānjiǎohánshù trigonometric function