Again, the answer to this question varies from company to company. And again, testing is the way to find out what works best. Typically, weekends and mornings seem to be times when multiple emails are opened, but since your audience may have different habits, it's best to experiment and then use your data to decide.
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“我们要让孩子在这里闻到墨香，触摸到文化的温度。”负责研学的石静介绍。。51吃瓜对此有专业解读
Here are common examples you'll run into across the difficulty levels: