When you see the black arrow display on the left of the edge and the narrow bounding rectangle, as shown in figure 8, drop the component.
如图8所示，当看到左边缘上显示黑色箭头，并伴有狭长的外接矩形时，放下该组件。
To compress the message payload, select the desired compression algorithm from the drop down box, as indicated below by the blue arrow.
要压缩消息有效负载，请从下拉框中选择所需的压缩算法，如下面的蓝色箭头所示。
Click the down arrow and a drop-down list will appear.
单击向下箭头，会出现一个下拉列表。
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