No hard and fast line can be drawn between the two.

二者不能截然分开.

《现代汉英综合大词典》

Nevertheless, no hard and fast line can be drawn between popularization and the raising of standards.

　　但是, 普及工作和提高工作是不能截然分开的.

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MACD lines give entry signals when the fast line crosses the slow line.

当MACD快线穿过慢线时,就给了进场信号.

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