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1·You all know why I am here. So I won't waste time on preliminaries.

你们都知道我为什么在这里。所以我就不浪费时间讲客套话了。《柯林斯英汉双解大词典》

2·You all know why I am here, so I won't waste time on preliminaries.

你们都知道我为什么来这儿，因此我就不浪费时间作介绍了。《柯林斯英汉双解大词典》

3·I am here to say yes.

我在这里说：是的。

4·That's because there is always a silent promise between us that says, I am here and you are not alone.

那是因为我们之间总有一个沉默的承诺：“我在这里，你并不孤单。”

5·After walking onto the stage, she began to speak, I know you have been laughing behind my back for years. Today I have a great chance to make you all laugh in front of me. That's why I am here.

走上舞台后，她开口说：“我知道你们在背后嘲笑我好多年了。今天我有一个很好的机会让你们在我面前笑。这就是我在这里的原因。”

6·I am safe while I am here.

我在这儿的时候，我很安全。

7·I am here, the wolf has swallowed me.

我在这儿，狼把我吞了。

8·I am here.

我在这里。

9·No one sent me, I am here on my own account.

没有人派我，我自己来的。《牛津词典》

10·I am here to help you, madam.

我是来帮您的，夫人。