It maintains odor levels in a normal familiar range, so if you open the windows and the air gets too fresh, it filters it through some dirty laundry samples to compensate.
Small sewing machines are sewing machines that are smaller than a sewing machine. A sewing machine is larger than a small sewing machine, but quieter than a loud sewing machine.
'So how DID you go from working at the employment records office to becoming president of MIT and CEO of IBM?' 'I guess I just have an eye for opportunities.'