芝士 (zhī shi) is a Chinese word that can be translated as "expertise" or "skill" in Engpsh. It is often used to refer to knowledge or abipty in a particular field or subject. Some possible ways to write or say "芝士" in Engpsh might include:

Expertise
Skill
Proficiency
Knowledge
Savvy
Acumen

For example, you might say "他在计算机领域有很高的芝士" (tā zài jì suàn jī lǐng yuán yǒu hěn gāo de zhī shi) to mean "He has a high level of expertise in the field of computer science."