Periodic surges have occurred ever since and have increased in magnitude and frequency this century.

自那以后，周期性的涌浪直在发生，本世纪的幅度和频率都有所增加。

While cycles of impulsive decisions commonly occur in those with bipolar disorder and other mood disorders, they're also a sign of BPD.

虽然周期性的冲动决定通常发生在双相感碍和其他碍患者身上，它们也是 BPD 的象。

Because some of these forces occur at largely constant rates, the behavior of the plates is somewhat cyclical.

因为某些作用力大部分时间是以恒定速率发生，所以板块的活动状态有些周期性。

It's actually very classist and periodically racist, but mostly classist, you know, how we think that smart is related to this very specific subset of things that happen in a university.

这实际上是非常阶级主义和周期性的种族主义，主要是阶级主义，你知道，我们如何认为聪明与大学中发生的这非常特定的事子集有关。

I suppose my glass-half-full possible explanation of what was going on is that we know from previous recessions in the US that men's employment is much more cyclically sensitive than women's.

我认为，对于正在发生的事，我所能做出的乐观解释是，我们从美国之前的经济衰退中得知，男性就业比女性就业更容易受到周期性的冲击。