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