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Don't understand what you're talking about a sink?
Keep in mind that the sewer pipes that are connected to the room should definitely be isolated from the indoor air by storing water. Check for yourself where the air is directly connected to the room.
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Is it a floor drain that is not odor-proof.
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Try it with a few orange peels in it.
It was a leaky toilet, and a check would show the cause.
It means that when you smoke, some gas enters the stomach and generates air pressure to the intestines, and you will feel like you have a bowel movement. Whether you smoke vigorously or have a habit of swallowing unconsciously. It's better not to smoke, or to smoke slowly!
Absolutely, it's a normal reaction. Don't worry, pregnant women can't have troubles!
There is a dispute of words, things are not continuous, the economy is not good, adopt it.