nowadays/at present

nowadays(副词)主要是用于将现在的风俗习惯与过去或将来作对比,因而它所指的时间段比较长,通常与一般现在时连用:

1. In some parts of the world nowadays, you often see musicians performing in the streets to passers-by. 现在世界上有些地区，你还可以经常看到音乐家在街头为行人演奏。

2. Nowadays the young people in China like to wear jeans. 如今中国的年轻人喜欢穿牛仔裤。

at present 所指的时间段一般比较短,有时可译为“此刻”“眼下”:

She's busy at present and can't speak to you. 她眼下很忙，不能和你讲话。

at present 有时也可指较长的时间段：

At present he's Professor of Chemistry at Oxford. 目前他是牛津大学的化学教授。