The tricuspid valve has three little flaps, or cusps.

它有三个小瓣，或尖瓣。

Remove the front cusp, raise the shelf, and you've got our human molars.

移除前尖端，提升牙架，你就得到我们人类的臼齿。

You do appear right on the cusp of something.

你在职场上可真是炙手可热。

Over time, the cusps were pushed out of line to make triangular crowns.

随着时间推移，这些尖端逐渐移位，形成了三角形的牙冠。

Well, just back from the cusp.

只要离开波峰就行。

The scientists say it’s on the cusp of a comeback.

而如今他们表示，这次开发可以算得上是上次尝试的回归。

The president says the nation's " on the cusp" of fundamentally changing the pandemic's nature.

拜登总统表示，美国正处于能够从根本上应对这场疫情的" 风口浪尖" 。

But we're right at the cusp of that, in sort of the domestic cat's evolution.

但我们对整个趋势的看法是对的，猫猫在人类驯服中发生的演变。

We've gone from economic crisis to recovery to the cusp of genuine resurgence

我们已经从经济危机的阴影中走出来, 走向了真实复苏的顶点。

Mr. Johnson said Britain was on the cusp of a rapid spread that demanded more draconian countermeasures.

约翰逊表示，英国已经处于疫情迅速蔓延的风口浪尖，需采取更为严厉的应对措施才行。