解释什么是现在完成式，加入下面的例句：
1. "We have received 50 international orders since launching the new product line yesterday."
2. "Our team has optimized product listings for the European market, resulting in a 30% conversion boost."
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The Present Perfect Tense is used to describe actions that happened in the past but have a connection to the present. It emphasizes the impact or result of past actions on the current moment. The basic structure is: subject plus have or has plus the past participle of the verb.