短语讲解：

1. So a perennial is the opposite of an annual. Perennials come back year after year.

come back回来
例句：I'm going away and I may never come back.
我要走了, 可能永远不再回来。
year after year年复一年(地)
例句：Year after year I have had a letter from Arthur on New Year's Day.
每年新年之际我都收到阿瑟的来信。

2. Milk can be made into cheese.

make into把…做成
例句：Waste products from factories can be made into road-building material.
工厂的废料可以制成筑路的材料。

3. Age also plays a part in terms for horses.

play a part in在...起作用;参与
例句：He has played an important part in carrying through the whole plan.
他在整个计划的实行中扮演了重要的角色。
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