今天我选择了扶梯，作为静力平衡的道具。

So, today I have chosen a ladder as my subject of static equilibrium.

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我时不时的带一只到工作室，把它放到我用来做道具的东西上，至于道具的选择，我总是选那些我认为拍出来效果会很有趣的东西。

Every now and then I will just take a frog into the studio and sit it on a a prop, I just choose things which I believe will make for an interesting photograph.

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为此我们要给这样道具选择一只模型。

We will have to choose a model for this prop to do that.

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