Meaning of tòu:
透
(bound form) to penetrate; to seep through; to tell secretly; to leak; to appear; to show
Yǔshuǐ yǐjīng tòu guò wūdǐng lòu le xiàlái.
雨水已经透过屋顶漏了下来。
The rainwater has seeped through the roof and dripped down.
Tā bǎ mìmì tòu gěi le biérén.
他把秘密透给了别人。
He leaked the secret to someone else.
Yǔ hòu, shān jiān de wù zhújiàn tòu chū yángguāng.
雨后,山间的雾逐渐透出阳光。
After the rain, the fog in the mountains gradually allowed the sunlight to appear.
thoroughly; through and through
Wǒmen yào bǎ zhège wèntí kàn tòu.
我们要把这个问题看透。
We need to see through this problem thoroughly.