四个短语都对，且意思相同：

1. all year

We worked hard all year. 我们整年都努力工作。

He’s been in and out of hospital all year. 他一整年经常入院出院。

2. all the year

The pass is kept open all the year. 通道一年到头畅通无阻。

Oranges abound here all the year. 这一年到头都有很多橙子。

3. all year round

This wine cellar stays at an even temperature all year round. 这个酒窖常年保持恒温。

The weather is so good here that we can swim all year round. 这里气候很好，我们全年都能游泳。

4. all the year round

I used to swim all the year round. 过去我曾经一年四季都游泳。

The mountain was covered with snow all the year round. 山上终年积雪。