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
一言为定
yī yán wéi dìng
1 (idiom) it's a deal
2 that's settled then
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)
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
人定胜天
rén dìng shèng tiān
1 man can conquer nature (idiom); human wisdom can prevail over nature
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
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)
命中注定
mìng zhōng zhù dìng
1 decreed by fate (idiom)
2 destined
3 fated
四通八达
sì tōng bā dá
1 roads open in all directions (idiom); accessible from all sides
尘埃落定
chén āi luò dìng
1 lit. the dust has settled (idiom)
2 fig. to get sorted out
3 to be finalized
官运亨通
guān yùn hēng tōng
1 (of a political career) everything is going smoothly (idiom)
定于一尊
dìng yú yī zūn
1 (idiom) to rely on a single authority to determine what is correct
2 to regard a source (or entity or individual) as the ultimate authority
居无定所
jū wú dìng suǒ
1 to be without a fixed residence (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