專心致志

with single-hearted devotion (idiom)

for a particular person, occasion, purpose / focused on one thing / special / expert / particular (to sth) / concentrated / specialized

to focus one's attention; to concentrate on (doing sth)

heart / mind / intention / center / core / CL:顆|颗[ke1],個|个[ge4]

to send / to devote / to deliver / to cause / to convey

(bound form) fine; delicate; exquisite

aspiration / ambition / the will

sign / mark / to record / to write a footnote