Theme
Auto
Light
Dark
Color-code pinyin tones
Show grass script (simplified only)
Example sources
Tatoeba
Save
简体
繁體
Zhictionary
All
All
Words
Sentences
Read the
search options documentation
for a full list of available search options.
1
matching entry and
0
matching sentences.
Words
必要條件
bì
yào
tiáo
jiàn
requirement
necessary condition (math)