为防止样本被污染,实验人员必须在无菌环境中将容器密封。Wèi fángzhǐ yàngběn bèi wūrǎn, shíyàn rényuán bìxū zài wújūn huánjìng zhōng jiāng róngqì mìfēng.To prevent the samples from being contaminated, laboratory staff must seal the containers in a sterile environment.
请把茶叶密封好,不然很快就会受潮。Qǐng bǎ cháyè mìfēng hǎo, bùrán hěn kuài jiù huì shòucháo.Please seal the tea leaves well, or they will soon get damp.
这个罐子密封得很好,放了一年的饼干还是脆的。Zhège guànzi mìfēng de hěn hǎo, fàng le yì nián de bǐnggān hái shì cuì de.This jar is sealed so well that cookies kept for a year are still crisp.