1. They're getting ready to take part in a NASA project to measure ozone.

take part in 参加…，参与…活动
例句：Nearly one in four children do not take part in any organised sport, new research shows.
最新研究结果表明，近1/4的孩子不参加任何体育活动。

2. But first, the students need to fill the ballon with helium gas, so it can rise.

fill with 装满
例句：The caisson would fill with oil from the leak.
沉箱将装满泄露处的原油。

3. The ballon will carry it into the atmosphere three times higher than jets airplane.

carry into 带进，搬进
例句：They try to carry viewers into these shows.
他们尝试将观众去看这些节目。

4. They need a lot of helium, fully blown up, the ballon will be 2 to 3 meters in diameter.

blow up （使）爆炸；产生
例句：It did not blow up overnight.
它不是一夜之间爆发的。
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