一技之长

proficiency in a particular field (idiom) / skill in a specialized area (idiom)

one / single / a (article) / as soon as / entire; whole; all; throughout / "one" radical in Chinese characters (Kangxi radical 1) / also pr. [yao1] for greater clarity when spelling out numbers digit by digit

skill

(possessive particle, literary equivalent of 的[de5]) / him / her / it

length / long / forever / always / constantly

chief / head / elder / to grow / to develop / to increase / to enhance