一个场景会根据天气情况出现戏剧系的变化，所以选择恰当的时间进行拍摄就显得尤为重要。
A scene can change dramatically depending upon the weather at any given moment. As a result, choosing the right time to shoot is of real importance.
锻炼时间的选择非常重要，因为恰当的时间可以激发你身体里的最大潜能。
The time of day when you choose to work out can make all the difference when it comes to working out to your maximum potential.
雪上加霜的是，首相桥本龙太郎正力图削减财政赤字，而他选择了一个最不恰当的时间。
To make things worse, then-Prime Minister Ryutaro Hashimoto was trying to reduce the government fiscal deficit - at the most inopportune time.
选择恰当的给药系统能明显增强药物疗效、延长作用时间及减少不良反应。
Choosing appropriate drug delivery system can apparently improve drug efficacy, prolong action time and decrease adverse reaction.
在媒体的选择上，要针对不同产品、不同媒体的特点进行媒体选择和媒体组合，并以适当的时间恰当的频率进行刊播；
In regard to the selection of media, the advertiser should select and combine the media with appropriate time and frequency according to the difference among products and media.
考虑到实验的酸性条件，反应时间不宜过长，对于一定离子浓度溶液应选择恰当的加入量。
For the acid reaction condition, the reaction time should not last long, and suitable amount of the solution should be added according to its ion concentration.
强调疗效的好与差，主要取决于患病时间的长短、临床病程及手术技巧和手术适应症的选择是否恰当。
The author emphasizes that the therapeutical effect depends on the duration of the disease, the clinical course, the skill of the operator, and the appropriate selection of indication.
强调疗效的好与差，主要取决于患病时间的长短、临床病程及手术技巧和手术适应症的选择是否恰当。
The author emphasizes that the therapeutical effect depends on the duration of the disease, the clinical course, the skill of the operator, and the appropriate selection of indication.
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