你可以说 "That pen is very beautiful." 来表达 "那支钢笔很漂亮" 的意思。

"Beautiful" 这个词是从拉丁语 "bellus" 演变而来,意思是美丽的、优美的或令人愉悦的。这个词在英语中通常用来形容人或物的外观。例如:

The sunset was beautiful. (夕阳很美)
She has a beautiful smile. (她有一个优美的微笑)
The garden is full of beautiful flowers. (花园里开满了美丽的花)

你也可以使用其他形容词来表达钢笔的外观,例如 "elegant" (优雅的)、"graceful" (优美的) 或 "attractive" (有吸引力的)。例如:

That pen is very elegant. (那支钢笔非常优雅)
The design of the pen is very graceful. (钢笔的设计非常优美)
The color of the pen is very attractive. (钢笔的颜色非常有吸引力)