Saying this out loud will break it.
Silence
半青半紫 (打一字)
素
一只狗,四个口(打一字)
器
七十二个小时 (打一字)
晶
You have this number of apples when there are 8 apples and you take away 2.
2
This is black when clean, and white when dirty.
Blackboard
早不说,晚不说 (打一字)
许
It counts numbers all its life, but never gets past 12.
Clock
It becomes shorter when you add 2 letters to it.
Short
一减一不是零(打一字)
三
另有变动(打一字)
加
Shorter than the rest, you raise it when it's the best.
Thumb
I start with an "e" and contain one letter.
Envelope
You want to share it when you have it. When you share it, you no longer have it.
Secret
刀出鞘(打一字)
力
上下一体(打一字)
This is yours, but is used more by others than yourself.
Your Name
一剑穿心 (打一字)
The only place where today comes before yesterday.
Dictionary
A yellow hat drops into the Red Sea and becomes this.
Wet
An odd number that becomes even when you take away a letter.
Seven
Take away 4 out of its 5 letters and it still sounds the same.
Queue
一大二小 (打一字)
奈
皇上的耳朵(打一字)
聋
Add this to make one disappear.
Letter 'g'