| Both sides of the hall were lined with doors and even the ceiling had trapdoors spaced at periodic intervals in it. |
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| Meet the trapdoor spiders, famed for their silk-lined burrows complete with emergency exits, hinged trapdoors and careful camouflage. |
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| Because the source code is available for all to see, secret or accidental trapdoors cannot hope to survive expert scrutiny by third parties. |
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| The trapdoors are made of soil, often clay, modeled into shape and reinforced with silk. |
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| Under polite questioning from the audience, he acknowledged that some closed-source commercial products have been found to have trapdoors themselves. |
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| The trappers also opened the trapdoors to provide ventilation in some locations. |
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| They would then open the trapdoors to allow the hurrier and his cargo through. |
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