But a great deal of work has been done beforehand in the way of product development, market research, test marketing and so on.
但是，有关产品开发、市场调研、试销等方面的大量工作事先都已经做了。
But a great deal of work has been done beforehand in the way of product development, market research, test marketing and so on.
但是，有关产品开发、市场调研、试销等方面的大量工作事先都已经做了。
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