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2. Platform screen doors - Wikipedia

   en.wikipedia.org/wiki/Platform_screen_doors

   However, these gates are less effective than full platform screen doors in preventing people from intentionally jumping onto the tracks. [14] These gates were first [clarify] in practical use by the Hong Kong MTR on the Disneyland Resort line for the open-air station designs. Most half-height platform edge door designs have taller designs than ...

3. Pet door - Wikipedia

   en.wikipedia.org/wiki/Pet_door

   A dog exiting through a pet door. A pet door or pet flap (also referred to in more specific terms, such as cat flap, cat door, kitty door, dog flap, dog door, or doggy/doggie door) is a small opening to allow pets to enter and exit a building on their own without needing a human to open the door. Originally simple holes, the modern form is a ...

4. Retractable roof - Wikipedia

   en.wikipedia.org/wiki/Retractable_roof

   A retractable roof is a roof system designed to roll back the roof of a structure so that the interior of the facility is open to the outdoors. [1] Retractable roofs are sometimes referred to as operable roofs or retractable skylights. The term operable skylight, while quite similar, refers to a skylight that opens on a hinge, rather than on a ...

5. Wikipedia:Language learning centre/Word list - Wikipedia

   en.wikipedia.org/wiki/Wikipedia:Language...

   Drawing up a comprehensive list of words in English is important as a reference when learning a language as it will show the equivalent words you need to learn in the other language to achieve fluency.