    ctx.fillText("卡路里占比(x)", 160, 195);  // Text in the right end of the horizontal axis.

    ctx.fillText("y/x = 2.0 高脂肪", 70, 50);  // Text in the super high y/x.
    //ctx.fillText("y/x = 1.3 高脂肪", 95, 65);  // Text in the high y/x.
    ctx.fillText("y/x = 1.3 适中脂肪", 115, 85);  // Text in the balanced y/x.
    ctx.fillText("y/x = 0.5 低脂肪", 140, 130);  // Text in the low y/x.

    drawArrow(ctx, 10, 190, 150, 190, 1, 'black');  // Horizontal axis.
    drawArrow(ctx, 10