中文版: http://www.geogebratube.org/material/show/id/6074 (Download GeoGebra file) 拖拉滑桿及點擊
+、-按鈕調校時鐘。正確地讀出時鐘所顯示的時間。
English version: http://www.geogebratube.org/material/show/id/9226 (Download GeoGebra file) Drag
the slider and click the + and - buttons to set the clocks. Tell the time from
the clocks.
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