用uncontaminated造句子，“uncontaminated”造句

In a perfectly controlled and totally sterile environment — uncontaminated by dirt, insects or fresh air — Japanese scientists are developing a new way of growing vegetables.

They always enter fresh, uncontaminated solutions and wash tanks.

Knowing that there are no victorious causes, I have a liking for lost causes: they require an uncontaminated soul, equal to its defeat as to its temporary victories.