The gas given off contains two carbon isotopes.釋放出的氣體包含兩種碳同位素

give off散發(光、氣味等)

The sun gives off heat and light.

太陽散發光和熱。

Rotten eggs give off a bad smell.

臭蛋散發出難聞的氣味。

The result will reveal the sort of food eaten by ancient humans結果將揭示古人類食用食物的種類

the sort of那種

He's the sort of person I really dislike.

他這種人我真不喜歡。

It was the sort of night when phantoms might walk.

這種夜晚正是幽靈出沒的時候。

So far, Julia's research has revealed that in the period leading up to the evolution of habilis,迄今為止朱莉婭的研究表明我們祖先在進化成能人之前

lead up to導致； 引導； 作為 ... 的準備；一直通往（某處）

The events that led up to the murder were shown in a series of flashbacks.

釀成謀殺案的各個環節是通過一系列倒敘手法來表現的。

The report describes the negotiations that led up to the settlement.

這個報導記述了達成協議的那次談判。