observational

1. ADJ Observational means relating to the watching of people or things, especially in order to learn something new. (尤指爲獲取新信息)觀察的[正式]

...observational humour. ...可觀察到的幽默。

The observational work is carried out on a range of telescopes. 觀測工作是借助於各種望遠鏡來進行的。