榆木脑袋

wǒ zěn me cái néng ràng nǐ de yú mù nǎo dai kāi qiào míng bai yóu chū hǎi tài yuǎn shì wēi xiǎn de

我怎么才能让你的榆木脑袋开窍，明白游出海太远是危险的？

How can I get it into your thick head that it’s dangerous to swim that far out in the sea?