Dense phase voidage can be estimated by cutting gas flow and following the rate of bed collapse.
采用切断流化床气源，并跟踪测量床面塌落速度的方法，可以测得浓相空隙率。
A few days after his collapse he was sitting up in bed.
他病倒后过了几天就在床上起身坐着了。
Do you find yourself so tired from taking care of a house full of kids and your elderly parent or disabled spouse that you collapse into bed exhausted at the end of the day?
你有没有发现自己每天忙于照顾年幼的孩子、年迈的父母和身体有残疾的配偶，到晚上睡觉的时候已经精疲力竭？
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