However, if you specify a border, it may contain a double strike of bold lines at the bottom of the box, along the x axis line (Cosmetically, this wouldn't look right.).

但是，如果指定边框，在框的底边沿着 x 轴可能有两条粗线（这看起来不太美观）。

youdao

A double-strike direct electric drive screw press is a new machine used in particle and dispersed material forming.

双击式直接电动螺旋压力机是用于颗粒材料及离散材料成形的新型机器。

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The pilot reported a double bird strike - a rare event where birds enter both engines.

VOA: special.2009.01.30

They follow workers at Honda who went out on strike and eventually received double-digit pay increases.

VOA: standard.2010.06.24

His double strike allowed not just a town, but an entire country to dream.

CNN: January 7, 2013 -- Updated 1530 GMT (2330 HKT)

As it was, the Blues had to be content with Blair's double strike to Frederic Michalak's solitary effort.

BBC: Cardiff Blues 9-6 Toulouse

The double strike killed off the match as a competitive spectacle, although Jermaine Pennant flashed in a couple of long-range free-kicks to give Birmingham some hope.

BBC: Marlon Harewood celebrates his opening goal