Tears are as universal as laughter, and grief is more complex than joy.
眼泪和笑声一样常见，悲伤比快乐更复杂。
Complex system is quite a universal objective reality.
复杂系统是相当普遍的客观现实。
Sand production of the gas well is a universal and complex problem.
气井出砂是一个带有普遍性的复杂问题。
Sand production of the gas well is a universal and complex problem.
气井出砂是一个带有普遍性的复杂问题。
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