对时常被称为自发变异 spontaneous variation
这一情况时常被称为“贸易条件效应”。
This result is sometimes called the "terms of trade effect".
当然在那时他时常被称为信鸽运动中一个极为重要的人物。
Yes, in those formative years of the sport he was often referred to as a person of immense importance.
这种风险时常被称为冰山，它们总是突然出现并会导致大额亏损。
Sometimes known as icebergs these risks appear suddenly and can result in large losses.
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