The fibres were replaced at regular intervals over the course of seven days and taken away for analysis by a device called a gas chromatograph-mass spectrometer.

在七天的实验里，每隔一定时间就要更换一次纤维，然后用一种叫做气相色谱质谱联用仪的装置提取以供分析。

youdao

You want to stay as far away from those dates as possible, from five to seven days.

你想要尽量远离这些日子，留出5 ~ 7天的缓冲期。

youdao

They arose, all the valiant men, and took away the body of Saul, and the bodies of his sons, and brought them to Jabesh, and buried their bones under the oak in Jabesh, and fasted seven days.

他们中间所有的勇士就起身前去，将扫罗和他儿子的尸身送到雅比，将他们的尸骨葬在雅比的橡树下，就禁食七日。

youdao

These symptoms last about four to seven days, and then go away without specific treatment in healthy people.

CNN: STORY HIGHLIGHTS

And so, what we're saying is that if you have the flu, you stay home for seven days, and add one day on after your symptoms have gone away.

CNN: John King: Flu and politics dominate Sunday talk