Human history began with oral stories with knot making and carving to strengthening memory.
人类历史最初皆以口语传诵为主，而以结绳刻契帮助记忆。
2
Only when we untie the knot can we comprehend the essence of the human spirit which advances in difficulty more clearly.
必须解开彼得拉克这个历史的结点，我们才能更清楚地理解人类自身在困顿挫折中屡踣屡起的精神实质。
3
As a contractual relationship knot of physical capital and human capital in business, long-run engaging relationship is an important incentive method of human capital accumulation and optimization.