Instead of aiming for a niche in an attempt to find a 'gap in the market', or to fill a hole that probably doesn't need filling, they cater to a wide range purposes.
它们试着满足各种广泛的要求，而不是瞄准于试图弥补某些市场的空白或者填补那些可能不必要填补的地方。
2
The enlargement of hole diameter increased the exposed area and pressure releasing range of bored coal seam, and raised gas drainage amount and discharging effect from holes.