shǐ / yòng / lí / xīn / jī / zhī / qián / qǐng / xiān / què / rèn / suǒ / yǒu / shì / guǎn / dōu / yǐ / jīng / gù / dìng / hǎo使用离心机之前,请先确认所有试管都已经固定好。Before using the centrifuge, make sure all the test tubes are securely fixed in place.