Click the down-arrow icon next to Input Text to see other options.
点击Input Text旁边的down - arrow图标以查看其他的选项。
Controls do this because the control needs to interpret some types of input, such as arrow keys, as having special meaning to that control.
之所以这么做是因为，控件需要将某些类型的输入(如箭头键)解释为对该控件具有特殊含义。
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