她花了两年的时间试验，以得到一个既美味又不伤害牙齿的食谱。
She spent two years conducting trials to get a recipe that was both tasty and tooth-friendly.
目的：探讨简化多次小睡潜伏时间试验（MSLT）的可行性。
Objective:To investigate the feasibility of the simplified multiple sleep latency test (MSLT) .
您多长时间试验一次救生艇机？谁负责操纵艇机？谁负责维护和修理艇机？
How often should you test lifeboat engine? Who takes charge of the operation? Who takes of maintenance and repair work?
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