1. Absence sharpens love, presence strengthens it. 
   离别情切，相聚情深。
2. The presence or absence of aspiration indicated by these marks. 
   上述符号所表示的送气音的存在或不存在
3. To him the presence or absence of his wife's sister was a matter of indifference. 
   对他来说，小姨子来不来，与他无关。
4. Tact is so closely related to courtesy that you cannot practice one without the other.It is an invaluable skill,just as noticeable for its absence as for its presence. 
   机智和礼节有很密切的关系，一个人不可能只具备其中一种而缺少另一种特质，机智是一项无价的处世技巧，表现机智和缺乏机智，同样会让人看得见。
5. Any of various substances, such as litmus or phenolphthalein, that indicate the presence, absence, or concentration of another substance or the degree of reaction between two or more substances by means of a characteristic change, especially in color. 
   指示剂任何一种具有下列功能的物质，即能通过自身性质的变化，特别是颜色的变化来表明另一种物质的存在、消失或聚集，或可以表明两种以上的物质相互反应的程度；例如石蕊、酚酞

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