While previous generations' career tracks were simple and mostly linear, now entire industries expand and contract at alarming speed.
过去数代人的职业轨迹很简单，大体上是一条直线，而现在，整个产业都会以惊人的速度扩张和收缩。
The associations were linear for each age, and the risk increased across the entire BMI distribution.
在各年龄段中成线性相关，危险程度在整个体重指数分布范围内逐渐增加。
The definition and feature of linear manifold are given. The operation of adding and multiplying is defined for entire linear manifold, hence, linear manifold space is obtained.
给出线性流形的定义及性质，并对线性流形的全体定义了加法与数乘运算，得到了线性流形空间。
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