Conclusion There was more definite relationship between occupational stress factors and CHD, but that between psychological factors and CHD should be studied further.
结论职业紧张因素与冠心病之间有较确定的关系，但与心理因素的关系需进一步研究。
It is advanced that leaf senescence should be studied further and regulated more effective on level of whole plant to avoid or reduce the loss on yield and quality caused by abnormal senescence.
从整株水平上加强叶片衰老的生理机制和控制技术研究，将为生产上控制衰老、减少叶片异常衰老造成的产量和品质损失提供有效的技术途径。
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