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Explanation: When the time period of the chart is defined as "tick", only the Lines type of chart is available. 从此句看，"tick"为 chart 的一种与日期有关的属性，对此类 chart，只适用 Lines 型，个人理解为：这是一种一行对应一个方框式图表，可能是过/到了某一特定时期就作个标记，以表示某一特定意义（如无须再计入/考虑等）
Scales the chart vertical axis in such a way that all the chart ticks or aggregates fit into the chart area. 此句说的是此类表格的布局，就是在图表中，可有“ticks”，或也可能有“aggregates”，设计时将上述两类要素都fit into the chart area（可能是图表的某一特定纵栏，经常在最右）以便填写、统计等。