接下来，研究人员引入了第三种选择，用第三只桨启动一个新的试验，让海豚选择跳过困难的试验。

Next the researcher introduced a third option, a third paddle that would initiate a new trial, giving the dolphin the choice of passing on difficult trials.

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今年他们已引入了3种新产品以扩大他们的范围。

This year they have introduced three new products to extend their range.

《柯林斯英汉双解大词典》

又有另一种行政日历被引入了。

Another calendar was introduced, an administrative one.

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The first one uses something called Z a compressibility factor, z.

下面我们就来看几个例子,第一种办法是引入压缩系数。

麻省理工公开课 - 热力学与动力学课程节选

And they also developed a very reliable way for introducing the virus, so that when they had a defined preparation of virus, then you want to make sure that everybody gets it in their skin in the right way.

他们还发明了一种可靠的方法来引入病毒,当人们有了确定的病毒制剂之后,就要要保证这些制剂都以正确的方式,注射至皮下

耶鲁公开课 - 生物医学工程探索课程节选

What TEAL does is a number of things, most importantly, from a lot of new point is we introduce physics laboratory at the terms of small desktop experience that are done in the classtory.

而TEAL项目所做的事情有很多，最重要的是提出了一个新观念,即引入物理实验室,以小型桌面实验为主的,在一种新型教室里进行。

麻省理工公开课 - 媒体、教育、市场课程节选