One way of doing this is to print the Drupal arg function straight into the class attribute value, as shown in Listing 5.
一种实现方法是直接在 class 属性值中输出 Drupal arg 函数的值，见 清单 5。
2
A sawtooth wave rises (or falls) in a straight line from a starting point to an ending point, at which time it instantaneously jumps back to the starting value.
锯齿波从某一始点到某一终点沿着一条直线上升(或者下降)，在终点的时候它马上跃迁回其起始值。
3
Drawn as graphs, they both made exponential curves, with their value increasing by multiples of two instead of by regular increments in a straight line.