Anumber of ladies in summer dresses and gentlemen ingrey frock-coats and tall hats stood on the lawn or satupon the benches;
一群身着夏装的女士和穿灰色长礼服、戴高礼帽的绅士或站在草坪上，或坐在长凳上；
Anumber of studies has shown that some bio-chemical processes can be activated by ultra-sound in the presence of enzymes and cells.
许多研究发现，在有酶或细胞参与的情况下，一些过程可在超声作用下被激活。
It is an evidence-based, nondrug, short-term (usually four to eightsessions) therapy based on the concept that chronic insomnia is maintained by anumber of physical and behavioral factors.
它是一个有证可循，无药物治疗的短期疗法（通常为四到八个疗程）。 它坚持在长期失眠是由一系列生理和行为因素导致的。
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