They can provide a useful overview—an aerial map, as it were, to familiarize you with the main landscape features to be encountered during a course.

它们可以提供一个有用的概览——一个航拍图，可以让你熟悉课程中遇到的主要景观特征。

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Have a big salad before the main course.

在上主菜前先来个大份的色拉。

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The research defined a recipe as a main course dish containing four or more ingredients.

该研究将菜谱定义为包含四种或四种以上配料的主菜。

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And for this small, enthralled crowd, Jackie was the main course--a Chinese banquet of star quality.

CNN: ASIANOW - TIME Asia

As a main course, I would suggest grilled filet mignon (or venison medallions if you can find them), accompanied by a carrot and chestnut gratin.

NPR: Scallop Mango Tartlets: Sweet Start to the New Year

For lunch, try the appetizer of wild mushrooms and, for a main course, grilled tuna salad.

FORBES: Fact and Comment