✔ 最佳答案
Usually "smell" can take on a positive or negative adjective, such as "good, nice, pleasant, fresh, bad, awful, foul, offensive, rotten etc." . "Odor", however, tends to take on negative adjectives, for example, we would usually say "bad odor", "unpleasant ordor", and not "good odor" or "nice odor' .
In general, when it comes to a quality perceived by the olfactory sense, "smell" is more neutual, odor tends to be more negative, and "aroma" is usually more positive.