1
write sth on the blackboard
表示书写的位置时，介词用 on。
The teacher wrote the new words on the blackboard.
老师把生词写在黑板上。
黑板
先理解核心含义，再看它在真实句子里的用法。
黑板
a board with a smooth dark surface used for writing on with chalk, especially in a classroom
The teacher wrote the new words on the blackboard.
老师把生词写在黑板上。
A large flat surface, finished with black slate or a similar material, that can be written upon with chalk and subsequently erased; a chalkboard.
用于粉笔书写的石板
sheet of slate; for writing with chalk
The teacher wrote the new vocabulary on the blackboard with white chalk.
老师用白色粉笔把新词汇写在黑板上。
Please look at the blackboard and copy the homework assignment.
请看黑板并把作业抄下来。
The classroom had two large blackboards at the front.
教室前面有两块大黑板。
表示书写的位置时，介词用 on。
The teacher wrote the new words on the blackboard.
老师把生词写在黑板上。
该句型用于说明黑板上存在某物。
There are some examples on the blackboard.
黑板上有几个例子。
clean 在这里是“擦、清洁”的意思，常用于课堂值日场景。
Could you clean the blackboard after class?
你能下课后把黑板擦干净吗？
Not this
There are two blackboard in the classroom.
Use this
There are two blackboards in the classroom.
汉语名词没有单复数变化，而英语可数名词 blackboard 在数量大于一时必须用复数形式 blackboards。
Not this
Please write the answer in the blackboard.
Use this
Please write the answer on the blackboard.
英语表示“在黑板上”用介词 on，说明在某个表面上；in 表示在空间内部，不能用于黑板表面。
Not this
I saw blackboard in the classroom.
Use this
I saw a blackboard in the classroom.
blackboard 是可数名词单数，前面需要加冠词 a；汉语没有冠词，学习者容易漏掉。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
在黑板上写字
The teacher wrote the new vocabulary on the blackboard.
老师把新词汇写在黑板上。
黑板擦
Please use the blackboard eraser to clean the board.
请用黑板擦把黑板擦干净。
在黑板前
The student stood at the blackboard and solved the equation.
那个学生站在黑板前解方程。
擦黑板
Who is on duty to clean the blackboard today?
今天谁值日擦黑板？
黑板用粉笔
The box of blackboard chalk was nearly empty.
那盒黑板用粉笔快用完了。
纪律混乱的学校
The new principal promised to bring order to the blackboard jungle.
新校长承诺要整顿这所纪律混乱的学校。
Use blackboard naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
black+board：一块黑色的板子，联想教室里老师用粉笔写字的黑板。
语域：neutral 常见场景：classroom、school “blackboard” 是普通可数名词，通常用于教学场景，语气中性；口语中也常说 chalkboard，两者都自然。
与 blackboard 中 -board 真正押韵的有 keyboard /ˈkiːbɔrd/、whiteboard /ˈwaɪtbɔrd/、snowboard /ˈsnoʊbɔrd/，重读元音及之后的部分均为 /bɔrd/。blackbird 和 blackberry 只有 black- 的拼写与读音 /blæk/ 相同，后半部分不同，不押韵。特别提醒：cupboard 虽以 board 拼写结尾，实际读作 /ˈkʌbərd/，与 blackboard 不押韵，不要按拼写读。
Dictionary facts from DICTIONARY_API_DEV, ECDICT, WIKTIONARY.