习得

to learn / to acquire (some skill through practice) / acquisition

surname Xi

(bound form) to practice / to study / habit / custom

to obtain / to get / to gain / to catch (a disease) / proper / suitable / proud / contented / to allow / to permit / ready / finished

structural particle: used after a verb (or adjective as main verb), linking it to following phrase indicating effect, degree, possibility etc

to have to / must / ought to / to need to

acquired / learned

(psychology) learned helplessness