n.[(+into/on/upon)]

1. 侵襲；侵入[C]
   make inroads into a country

   侵襲某個國家

2. 侵害；侵佔；侵蝕[P]
   inroads on the domestic market

   對國內市場的侵蝕

n.

1. an instance of something being encroached on or reduced:
   the firm is making inroads into the UK market.
2. a hostile attack.