There is one difference to note here: because an image button is a click-able form element, you should always provide alternate text for it.

这里有一个要注意的不同点：因为图像按钮是可单击的表单元素，所以您应该总是为它提供替代文本。

youdao

Yes, you can use a variable for the name of the form, but what if an alternate presentation doesn't actually use a form?

虽然可以对表单的名称使用一个变量，如果碰到不使用表单的呈现，应该怎么办呢？

youdao

Some people, however, never develop severe mania but instead experience milder episodes of hypomania that alternate with depression; this form of the illness is called bipolar II disorder.

但是，一些人从未发展成严重的躁狂，而是处在较温和的轻躁期。这种形式，我们称为双相ii型。

youdao

Passengers who opt out of the screening receive an alternate form of checking, which includes a pat-down procedure.

CNN: 150 more full-body scanners to go in U.S. airports