投入

The old man was completely absorbed in his work.

The railway will go into service next month.

throw oneself into sb's arms; rush into one's arms

throw in the whole labour force

plunge into battle/war; go into battle

go into service; be put/brought into use

be put into production; go into operation

fling/throw/hurl oneself into work

She concentrates on whatever she does.

Foreign businessmen have poured enormous capital into this region.

Governments at different levels should increase their input in agriculture.

increase local funding for education

input into education; educational expenditure