以schrack的例句中有哪些关键词?

Schrack

• A person who is a master of a particular craft or activity.
• A person who is skilled in a particular area.

例句：

• He's a schrack at painting.
• She's a schrack of languages.

请问，关键词是什么?

关键词是 "schrack"。它在例句中用于定义 "一个拥有或擅长特定技能或活动的个人"。