trial run

Từ điển WordNet v3.1 - WordNet Dictionary

noun

trying something to find out about it
- a sample for ten days free trial
- a trial of progesterone failed to relieve the pain
• Syn:
trial, test, tryout
• Derivationally related forms:
try out (for: tryout), test (for: test), try (for: trial)
• Hypernyms:
experiment, experimentation
• Hyponyms:
field trial, field test, alpha test, beta test, road test, trial balloon