semiskilled worker
Refers to a worker who has some training and experience but is not yet fully skilled; often used in industrial or labor contexts.
This factory is hiring semiskilled workers.
He works on the assembly line as a semiskilled worker.
熟練工 is a fully skilled worker, while 半熟練工 is semiskilled.
未熟練工 is an unskilled worker, one step below 半熟練工.
Compound of 半 (half, semi-), 熟練 (skill, proficiency), and 工 (worker, craftsman).