Parts of the trigger are exchangeable.
发现它们部件可以互相替换。
But though labour be the real measure of the exchangeable value of all commodities, it is not that by which their value is commonly estimated. It is often difficult to ascertain the proportion between two different quantities of labour.
但,尽管劳动衡量所有商品交换价值真正尺度,但它并不通常用来估计商品价值尺度。通常很难确定两种不同劳动量之间比例。