1 lit. doesn't (even) enter a single aperture (of one's head)
2 I don't understand a word (idiom)
3 it's all Greek to me
一通百通
yī tōng bǎi tōng
1 grasp this fundamental point and all the rest will follow (idiom)
串通一气
chuàn tōng yī qì
1 to act in collusion (idiom)
久病成良医
jiǔ bìng chéng liáng yī
1 long illness makes the patient into a good doctor (idiom)
互通有无
hù tōng yǒu wú
1 mutual exchange of assistance (idiom)
2 to benefit from each other's strengths and make up each other's shortfalls
3 to reciprocate with material assistance
4 scratch each other's back
八仙过海，各显神通
Bā xiān guò hǎi , gè xiǎn shén tōng
1 lit. the Eight Immortals cross the sea, each showing his own special talent (idiom)
2 fig. (of each individual in a group) to give full play to one's unique capabilities
切中时病
qiè zhòng shí bìng
1 to hit the target where it hurts (idiom); fig. to hit home
2 to hit the nail on the head (in an argument)
半通不通
bàn tōng bù tōng
1 to not fully understand (idiom)
博识多通
bó shí duō tōng
1 knowledgeable and perspicacious (idiom)
同病相怜
tóng bìng xiāng lián
1 fellow sufferers empathize with each other (idiom); misery loves company
丧心病狂
sàng xīn bìng kuáng
1 deranged
2 demented
3 berserk (idiom)
四通八达
sì tōng bā dá
1 roads open in all directions (idiom); accessible from all sides
多愁多病
duō chóu duō bìng
1 much sorrows and illness (idiom); melancholy and weakly
官运亨通
guān yùn hēng tōng
1 (of a political career) everything is going smoothly (idiom)
弄懂弄通
nòng dǒng nòng tōng
1 to get a thorough understanding of sth (idiom)
心有灵犀一点通
xīn yǒu líng xī yī diǎn tōng
1 hearts linked as one, just as the proverbial rhinoceros communicates emotion telepathically through his single horn (idiom); fig. two hearts beat as one
政通人和
zhèng tōng rén hé
1 efficient government, people at peace (idiom); all is well with the state and the people
时运亨通
shí yùn hēng tōng
1 our luck is in, everything is going smoothly (idiom)