hay的复数形式是直接加s，即hays。hay可作名词和不及物动词两种词性，作为名词时，是可数名词，含义为“干草”、“草料”、“少量的钱”；作为不及物动词时，含义为“用干草喂割草晒干”、“把草制成干草”。

1、作为可数名词，意为干草;(用作饲料的)草料;少量的钱。

例句：He drove by with a big load of hay

他载着一大车干草驶过。

He could smell muck and clean fresh hay.

他能闻到粪臭和清新的干草味。

Farmers cut the hay, fork it on to a cart and then store it in barns.

农夫们割下干草，用叉子把草叉到车上，然后拉到谷仓贮存。

These men have quarreled over the price of a load of hay.

这帮人为了一车干草的价钱争吵不休。

That's because a bed was often a big bag with hay inside in the past.

那是因为在过去，床经常是一个装满干草的大袋子。

This is also true of soil, grain, hay and animals.

也可以通过土壤，谷物，干草和动物进行传播。

Mulch with hay or straw to protect them from cold temperatures.

用干草覆盖，保护球茎免于寒冷气温的伤害。

Horses eat hay; cows eat grass.

马吃草料，牛吃青草。

The preliminary list of candidates include: xilingol hay station ranch.

初期候选名单上包括：锡林郭勒草料站牧场。

2、作为不及物动词，意为把（草）制成干草;用干草喂割草晒干。

例句：We knew that war was coming, and were determined to make hay while we could.

我们知道战争即将爆发，决心要趁早抓住有利时机。