我如何打开这个门?
除了警察没有人能打开这个门。
否则,我们不能打开这个门,也就不能从这里逃出去。
I said. 'Otherwise, we can't open the door and escape from here.
It has a gate on it and that gate is in open or close state depending on whether a ligand is present or not.
在这个通道上有个门,这个门是打开还是关闭,取决于配体到来与否
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