stimulus

• Nothing happens until the excitatory stimulus exceeds a certain "threshold" value .
  兴奋性刺激超过某一临界值以前毫无反应。
• The new techniques of direct detection have given a profound stimulus to such activity .
  新的直接探测技术也给予这种活动以有力的促进。
• They haven't got any intellectual stimulus such as you get up here in the city .
  他们不象你们生活在城市里的人，在智力上得不到任何启发。
• The stimulus for such change is usually a new discovery or a recently advanced theory .
  推动这种变革的通常是一个新的发现或一个新发展的学说。
• Adipose tissue is in a state of continuous turnover and is sensitive to nerves and hormonal stimuli .
  脂肪组织在不断地更新，对于神经和激素的刺激很敏感。
• It introduces, at the same time, an element of chance and adventure which adds to the stimulus of city life .
  同时，它又提供各种机会和冒险，使城市生活益发富于刺激性。
• Mr. tupman did as he was requested; and the additional stimulus of the last glass settled his determination .
  特普曼先生照他的话做了，这追加的最后一杯兴奋剂使他决定了。
• A positive stimulus to city growth was required transform the predominantly agricultural nature of the area's economy .
  改变以农业为主的地区经济是促进城市发展的一个积极刺激。
• Stress could be seen as a stimulus characteristic, perhaps best defined as an intense level of everyday life .
  应激可被看作一种刺激特征也许可适当地定义为“日常生活的紧张状态”。
• Migration of adult worms may occur spontaneously or as a result of some stimuli such as fever or tetrachloroethylene .
  成虫的移行可自然发生，或因一些刺激诸如发热或四氯乙烯而造成。