通过不断变换使用身体的不同区域（在这里是大脑），变换节奏能使你在更长时间内精力充沛。
Pacing--by frequentlyswitching which parts of your body (or in this case, brain) you'reusing--lets you stay fresher for a longer period.
变换你的语调和节奏能强调重点话题并保持对人们的吸引力。
Varying your tone and pacing creates emphasis on key topics and keeps people engaged.
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