breakthrough, an important discovery or event that helps to improve a situation or provide an answer to a problem, root cause, the fundamental reason for the occurrence of a problem, extract /ɪkstr'ækt/, obtain a substance from something else, for example by using industrial or, stick (smth) into smth, to push a pointed object into or through something, or (of a pointed object) to be pushed into or through something and stay there, the thin end of the wedge/a slippery slope, involved in a course of action that cannot be stopped and that will lead to failure or serious trouble, undertake, to do or begin to do something, especially something that will take a long time or be difficult, pave the way for, to prepare the way (for); facilitate the introduction (of), down to, the responsibility or fault of, duplicate, to make an exact copy of something, adverse, having a negative or harmful effect on something, devise, to invent a plan, system, object, etc., usually using your intelligence or imagination:.

Lesson_25_Science

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