莫納漢強調，正是這些細膩的語用差別，讓那些新興語言學習科技所做的宏大承諾值得打上問號。
英國商會（BCC）估計，15%的關稅稅率上調將使英國出口到美國的商品關稅成本增加20億至30億英鎊（27億至40億美元）。
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6. Is email marketing still effective?Email marketing is one of the most effective ways for a business to reach its customers directly. Think about it. You don't post something on your site hoping people will visit it. You don't even post something on a social media page and hope fans see it. You're sending something straight to each person's inbox, where they'll definitely see it! Even if they don't open it, they'll still see your subject line and business name every time you send an email, so you're still communicating directly with your audience.
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swap(&arr[0], &arr[i]); // 堆顶(最大)换到末尾