PREP 1-106

Officials at the United States Mint
believe that the Sacagawea dollar coin will be used as a substitute for four quarters more than for the dollar bill because
it weighs only 8.1 grams, far less than four quarters, which weigh 5.67
grams each.

这里less than后面是否需要加that？
        因为这里是weight的比较

我觉得不用

这里是直接"A比B轻",而不是"A的重量比B的重量小"~~

A weighs less than B  /   A's weight is lower than B's