The pronunciation of '鼻子' in English is 'bí zǐ'.

To break it down, the first syllable 'bí' is pronounced with a 'bee' sound, like the insect. The second syllable 'zǐ' is a bit more complex. The 'z' sound is similar to a 'dz' sound, and the 'ǐ' is pronounced with a rising tone like the 'ee' sound in 'see'.

When saying the word '鼻子' in English, it's important to emphasize the rising tone on the second syllable 'zǐ'. This helps to distinguish it from other similar sounding words like 'bēi zǐ' which means 'cup' in Chinese.

Overall, practicing the pronunciation of '鼻子' in English can be challenging at first, but with time and practice, it will become easier to say.