After the 9 minute reading, add 1 quart by weighing the empty container then adding oil to the container while weighing until the weight equals the sum of the empty container weight plus 1 quart oil.

• 经过9分钟读书，购买一夸脱的空集装箱称重然后添加油的容器，而体重的重量等于之前的总和，空箱重量加1夸脱石油。