经过: pass; go through; go by长: older; elder; senior时期: period试验: experiment; test; trial经过长时间轰击之后: after a long bombardment长时期: cycle; long duration长时期的: prolonged长时期航天: prolonged space flight成长时期: youth极长时期: aeon; eon生长时期: the growing season增长时期: a glowing period族长时期: the patriarchal period播种期试验: date test长期试验: long run test; long term test; long test run; long time test; long-run test; long-term testing; permanent experiment; permanent testing; prolonged test; test of long duration长周期试验: long period test初期试验: initial test; initial trial定期试验: periodic test; routine test定期试验表: routine test schedule短期试验: short term tests; short time test; short-term test; short-time test短周期试验: short-period test二期试验: phase ii trials; secondary testing三期试验: phase iii trials使用期试验: end usetesting; end-use test; life testing四期试验: phase iv trials
