Each medal has a jade inlay, a flat jade disk with a hole in the center.

每块奖牌都有碧玉镶嵌，其形状扁平，中间有孔。

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Drilling on inclined surfaces has such problems as the decrease of hole accuracy and damage of tools compared with the drilling on flat surfaces.

斜面上钻孔与平面上钻孔相比，由于加工初期条件差，孔的相对位置精度低，刀具更容易折损。

youdao

In the construction period of some flat earthwork deep hole blasting, the price of blasting materials was rising, so how to save the cost was the main problem faced the project.

某场平土石方深孔爆破施工期间，恰逢爆破器材价格上涨，如何节约爆破成本是此工程面临的主要问题。

youdao

The only hole I couldn't knock out was the one around a flat, essentially 0% return.

FORBES: Break Their Crystal Balls

The sample comes from a hole about 2.5 inches deep drilled on Feb. 8 in a flat plate of sedimentary bedrock that the space agency managers have named "John Klein" in memory of a Mars Science Laboratory deputy project manager who died in 2011.

WSJ: Rover on Mars Extracts First Rock-Core Sample