In the descriptive sense, people speak of luck after events that they find to be fortunate or unfortunate, and maybe improbable. Therefore, cultural views of luck vary from perceiving luck as a matter of random chance to attributing to such explanations of faith or superstition.
Chirping can be due to misalignment of the drive belt, but could also be due to pulley misalignment, worn pulley bearings, worn belt ribs, contamination from oil, coolant, power steering fluid, brake cleaner, belt dressing, or other substances. Squealing is usually caused by slipping between the belt and the pulleys.
Whining is often caused by a malfunction or blockage within the ballcock assembly, or refill valve. A whining noise when your toilet tank is filling may be the result of something simple, such as a partially closed valve. But often the problem is that one or more parts within the ballcock assembly needs cleaning or replacement.