G20本来是威力加强版的G8——G8是由七个世界上最富裕的国家组成的集团，而额外的那个位置是留给俄罗斯的。
The G20 is meant to be a supercharged version of the G8 - which is the group of seven richest nations with an extra place set for Russia.
这项研究由七个实验组成，一些实验会分成两个部分，每个部分由19到22岁的20到57个人的小组来完成。
The research consisted of seven experiments, some split into two parts, each with a group of between 20 and 57 people aged 19 to 22 years old.
毕氏“全音阶”范围仍然是多数西方音乐的基石，它由七个音符组成。
The Pythagorean "diatonic" scale, still the basis of most Western music, is made up from seven notes.
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