Tāmen liǎng jiàn shì kàn sì xiāngguān, shí zé háobùxiānggān.
The two things seem related but are in fact completely unrelated.
Tips
memory
毫 means 'not in the slightest,' 不 reinforces the negation, and 相干 means 'to have a connection.' Stack the negations: 'not the slightest bit connected.'
