The subsequent two decades have seen much observational and theoretical work aimed at this problem.(接下來的二十年中，有許多觀察和理論的研究是專注在這問題上。)

Theory and some observational data pointed to the likelihood that they were ubiquitous.(理論和一些觀測數據則指向他們曾經普遍存在的可能性。)

Jane herself had predicted this finding, from observational data, two decades earlier.(其實早在二十年前，珍從觀測數據中就已經預測到了這樣的發現。)

For some of these questions, observational studies are the best we are going to get.(因為這樣的一些問題，觀察性的研究是我們所擁有的最好方式。)

He added: "People have been killed. People have been hurt. It's more than observational kind of data."(他又補充說：“有人被殺，有人被傷害。現實遠比只能靠觀察得出的數據復雜。”)

Observational humor is often a call-back or reference to something that got a laugh earlier.(通過觀察而作的幽默常常是對早些時候的笑話的回味或以此為參考。)

Observational studies are often misleading.(觀測研究常常會誤導。)

Researchers created a new supercomputer model, based on observational data and the "Lambda Cold Dark Matter" theory of the universe.(研究人員在觀測數據和蘭姆達冷暗物質模型的基礎上構建了一個新的計算模型。)

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

Observational assessment techniques have become much more sophisticated, reducing the limitations just presented.(觀察性評估技術已經變得更加復雜，它減少了剛剛提出的限制。)