tutelage

在导师的悉心指导下，他很快掌握了实验技巧。

Under his teacher's ___tutelage, he quickly learned the lab techniques.

这位老人在失去自理能力后，被法院指定由其侄子担任监护人。

After losing the ability to care for himself, the elderly man was placed under the ___tutelage of his nephew by the court.