human guinea pigs, the first people to have something new tested on them (used informally)., vice versa, used to show that the opposite of what you said is also true, to thread the needle, to do a difficult task that requires skill and careful balancing, the whole picture, a complete view of something, including all important facts and ideas., to wade through something, to spend a lot of time and effort doing something difficult or boring (often reading), on top of (something), in addition to something, especially something unpleasant

animal testing

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