课程必须被视为帮助孩子解释自己的经验并指导他进一步经验的手段。
皮革行业必须发展,以满足环境标准和消费者期望,同时不牺牲质量。
The past is a shadow that follows us, no matter how fast we run.
Opposition brings concord. Out of discord comes the fairest harmony.