Use the Outer glow option to add a very slight grey border, adjusting the Spread to the Max will turn the default glow into a solid strip of colour which helps add this double stroke effect.
继续用外发光来添加一个浅灰色的边，调整扩展值到最大这样我们可以得到一个双边线效果。
2
They also offer an option that allows your hidden door to double as a vault door, so your valuables stay double protected.
他们还提供了一个选择，可以使你的隐蔽门也充当地下室，所以你的贵重物品得到双倍保护。
3
Another option that includes the use of original manufacturer's packaging is double boxing.