很多动物进化出了明确表述玩耍的信号。
Many species have evolved clear signals to delineate playfulness.
德国发出了一个信号，这个信号在印度和其他国家，以及在德国的移民社区，都得到了明确的响应。
Germany was sending a signal, one that was clearly received in India and other countries, and also by Germany's own immigrant community.
我们得到明确的信号——喉咙痛和流鼻涕，我们知道即将发生什么。
We get clear signals - sore throats and runny noses. We know what is about to happen.
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