It's got to be the past perfect continuous!

应该是过去完成进行时。

But now our observation is continuous.

但现在我们的观察是连续的。

The fertility fall was continuous. And contraceptive use spread rapidly.

生育率下降是持续的。避孕用具的使用迅速蔓延。

The first will be the past continuous.

第一回合是过去进行时。

This is the present perfect continuous, the past perfect uses had.

这是现在完成进行时，过去完成时使用的是 had。

Symptoms of scurvy appear within a month, if deficiency is continuous.

如果持续缺乏，一个月之内会出现坏血病的症状。

" Had been walking" is the past perfect continuous of the verb " walk" .

“Had been walking” 是动词“walk”的过去完成进行时。

This is the past simple and this one is the past continuous.

这是个一般过去时，这个是过去进行时。

And once on the market, there's continuous monitoring of it's effects.

一旦疫苗被投放到市场，就会持续监测它的效果。

As you hear, the bombing and destroying of the houses is continuous, non-stop.

正如你所听到的，对房屋的轰炸和摧毁持续不断，分秒不停。

It is part of a continuous verb tense — in this case, the present continuous.

它是动词进行时的一部分——在这个标题中，是现在进行时。

But this current drought is continuous and recurrent. It's more than we can manage.

但现在的干旱持续不断且反反复复。超过了我们的承受能力。

It's the present perfect continuous because you began in the past and still live there now, right?

用现在完成进行时，因为发生在过去，现在仍然生活在那里。

After the explosion of community gardening in New York City, there have been continuous threats to the spaces.

在纽约市社区园艺大爆发之后，空间一直受到威胁。

Swimming, bicycling, arm cranking or any form of activity that is continuous in nature will provide health benefits.

游泳、骑车、屈臂训练或任何在自然环境下持续性的活动都有益于健康。"

Finally, there's the laryngopharynx, the part of the pharynx that's continuous with the larynx or the voice box.

最后，这个部分是咽喉，即咽部与喉咙相连的地方。

That one is the present continuous.

那个是现在进行时。

These are continuous processes, they are things that lie on a continuum, you can be more sick or less sick.

这些是连续的过程，它们是位于连续统一体上的东西，你可能会病重一些或病轻一些。

When the transition between tones is continuous, it’s called a Shepard–Risset glissando.

当音调之间的过渡是连续的时， 它被称为 Shepard–Risset glissando。

Experts say that what is needed is continuous attention and maintenance.

专家表示，需要的是持续的关注和维护。