The pronunciation of “杵颅” is “chǔ lú”. In English, “杵” can be translated as “pestle”. And “颅” can be translated as “skull”. When pronouncing “chǔ lú”, pay attention to the initial consonants and vowels. “chǔ” is pronounced with a rising tone, and “lú” is pronounced with a second tone. Remember to enunciate clearly and practice several times to master the correct pronunciation. ????