加紧的英文：
intensify
speed up
step up

参考例句：

A rising westerly wind was whipping up a moderate sea
西风逐渐加紧，平静的海面上起了波浪。

enforce stricter control on;Clamp down on
加紧管制

To take up the slack of;tighten.
拉紧绳子;加紧

In the meantime we pressed on with the airlift.
与此同时，我们加紧进行空运。

In the meantime we pressed on with the airlift
与此同时，我们加紧进行空运。

That year Hitler heated up the aggressive war in Europe
那一年，希特勒在欧洲加紧进行侵略战争。

The police will clamp down on speeding starting next month.
警察将自下个月起加紧检肃超速。

If you apply yourself to learning English, you will soon master it.
如果你加紧学习英语，你不久就会掌握它。

If we press ahead, we can get home before dark.
如果我们加紧赶路，天黑前可以到家。

I must press on with my work because it is late.
我必须加紧干这活，因为天晚了。

intensify是什么意思：
v. （使）加强，强化

Her anger intensified.
她更加生气了。

The search intensified as dusk approached.
随着黄昏将至，搜寻加强了。

As a result contagion has intensified.
结果，这反而加剧了传播。

speed是什么意思：
n. 速度，速率；快速，迅速
v. 迅速前进，快行；促进；加速，使加速

The speed of a train differs greatly from the speed of an airplane
火车的速度与飞机的速度大不相同。

The car is gaining speed.
那辆轿车正在加速。

The worker is timing the speed of the machine.
这名工人正在调整机器的速度。

step是什么意思：
n. 脚步；步态，步伐；步骤；措施；阶段，等级；台阶，平台；舞步
v. 踩，踏；跨步，行走；跳舞；使成阶梯状

step by step welding
跨步焊法

It is a step class.
这是踏板操训练班。

They are not in step with the times.
他们跟不上时代的步伐。