Melt butter in a medium saucepan over medium-low heat. Add onion and garlic, and cook, stirring, until translucent, about 6 minutes.

取一只中等炖锅，放入黄油，中火加热。加入洋葱和大蒜，搅拌，煮大约六分钟，直到黄油呈半透明。

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While you're dragging, only the translucent rectangle moves-the original element stays put until the mouse button is released.

当拖放时，只有这个透明的矩形会移动—初始的元素保持不动直到鼠标按钮被松开为止。

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When you release the mouse button, the dragged element and the drag target switch places, and all translucent rectangles disappear until the next swap.

当松开鼠标按钮时，被拖动的元素和拖放到的目标元素就会互换位置，而且所有透明矩形也会消失，直到下一次切换。

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