But in your presence I am lost for words.

可你一出现我却梗塞了,说不出话来.

For the first time since Harry had known him, Fred seemed to be lost for words.

哈利认识弗雷德到现在，第一次看到他说不出话来。

Russell, who was never lost for words, replied, Imagine if it had my beauty and your brains.

向来善于应对的罗素回答道：“想象一下，要是他长得像我而头脑又像你呢？”