[00:09.37]tentative 试验性的 trial
[00:15.85]Tentative measures have been taken to  settle these refugees.
[00:22.12]mechanical 机械的
[00:26.49]exact 精确的 严格的 accurate, precise
[00:31.37]By asking the student to repeat the exact  words he had just said, the teacher proved  himself an exact person.
[00:41.83]theoretical 理论的 academic
[00:45.97]precise 周密的 精确的 accurate, exact
[00:50.82]trial 试验性的
[00:54.27]specimen 标本 样品 sample, instance
[00:59.02]symbol 符号 emblem, token
[01:02.93]symbolic 象征的 符号的
[01:07.38]precision 精确 精密度 accuracy, exactness
[01:11.32]doctrine 学说 theory
[01:14.94]How are the doctrines of the two churches  different?
[01:19.67]threshold 阈值 门槛 doorsill
[01:25.50]expertise 专门知识 know-how, special skill
[01:30.65]Do you have the expertise required to tune  the piano?
[01:35.87]institute （研究）所
[01:39.54]invent 发明 create, originate
[01:43.09]The inventor wanted to invent something  that no one had thought of before.
[01:50.18]dissect 详细研究 analyze
[01:53.68]Bill dissected a small shark in anatomy  class.
[01:58.69]contrive 发明 invent
[02:02.96]A group of scientists contrived a new  synthetic plastic.
[02:08.63]launch 发射 投射 send off 推出
[02:14.06]My company launched a new insurance plan.
[02:20.47]devise 计划 发明 create, invent
[02:24.51]The student devised an excuse to skip  class without being caught.
[02:31.44]gauge 精确计量 calculate, measure
[02:36.69]Tom gauged the distance to the river to be  about a mile.
[02:42.61]accurate 准确的 正确的 exact, correct
[02:47.03]Your statements about the cost of the  house were not accurate.
[02:52.79]scale 规模 尺度 天平
[02:58.20]I'll be glad when I tip the scales at a  few pounds less.