名詞 over time:

1. work done in addition to regular working hours
   同義詞：overtime
2. playing time beyond regulation, to break a tie
   同義詞：overtime, extra time

副詞 over time:

1. beyond the regular time
   同義詞：overtime

1. As a result, nacre thickness is sometimes just a cosmetic layer that can wear thin over time.
   所以真珠質(zhì)的厚度就像臉上化妝品，不久就會磨薄了。