• 1. be behind time: 落后
• 2. be behind the time: 落在时代后面

• 1.For the second experiment, Baker told the subjects that they would be stared at from time to time from behind in a laboratory setting.
  在第二个实验中，Baker 告诉实验对象，他们在实验室里会被不时地从后面盯着看。
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• 2.The empty shell of a snail or clam may be left behind, and if it is sufficiently durable and resistant to dissolution, it may remain basically unchanged for a long period of time.
  蜗牛或蛤蜊的空壳可能会被留下来，如果足够持久和抗溶解，它可能会在很长一段时间内基本保持不变。
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• 3.After all, the sentiment behind those poignant words can be traced all the way back to a time when our earliest ancestors did indeed work for food.
  毕竟，这些让人痛苦的文字背后的情绪可以追溯到很久很久以前，我们的先祖的确为了食物而工作。
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