599 复习

She spoke quietly because she didn't want Lucy to hear. 她说话很轻，因为不想让露西听到。

Because she didn't want Lucy to hear, she spoke quietly.

I'm laughing cos I'm so happy. 我笑是因为我很高兴。

She spoke quietly cos she didn't want Lucy to hear. 她说话很轻，因为不想让露西听到。

You can go first as you're the oldest. 你可以第一个去，因为你年纪最大。

They're very expensive, since they're quite hard to find. 它们很贵，因为很难找到。

Are you feeling unwell because you ate too much? 你是不是因为吃得太多而感到不舒服？

economy 经济

economics 经济学

economic

economical

经济的

economic 经济的，经济学的，经济上的

economic growth 经济增长    

economic policy 经济政策

economical 经济的，实惠的，省钱的，节俭的，节约的

not using a lot of money

It's very economical.这个很实惠/划算/经济。

It's more economical.这个更实惠/划算/经济。

你应该大量购买日常食品，这样更实惠。

everyday foodstuffs 日常食品

foodstuff(s) 食物；食品（原料）

in bulk 大量，批量（bulk大量，大规模）

You should buy everyday foodstuffs in bulk - it's more economical. 

economical + ly —> economically 副词，经济地，节俭地，精打细算地

She lives very economically. 她生活非常节俭。