Despite having no external cues, he fell asleep, woke up, and ate at fixed intervals.

尽管没有外部提示，他还是以固定的时间间隔入睡、醒来和进食。

At fixed intervals she paid a visit to her own country; but this last had been longer than any of its predecessors.

她每隔固定的时间访问自己的国家。但这最后一个比它的任何前任都长。

The spring, that year, was delicious to Betton. His college professor continued to address him tersely but cogently at fixed intervals, and twice a week eight serried pages came from Florida.

那年的春天，对贝顿来说是美好的。他的大学教授继续以固定的时间间隔简洁但有说服力地向他讲话，每周两次，八页从佛罗里达寄来。