1.delivery service 送貨服務(wù)

例句：Alibaba is experimenting with a drone delivery service as the Chinese ecommerce group seeks ever faster ways to put its goods in eager consumers'hands.
阿里巴巴（Alibaba）正在測試無人機(jī)送貨服務(wù)，這家中國電子商務(wù)集團(tuán)尋求以更加快速的方式，將商品送到急切的消費(fèi)者手中E@gKJ_M|tY7P#。

2.on-demand 按需

例句：Both engines have on-demand engine coolant pumps to improve fuel economy and increase power.
這兩個引擎都按需發(fā)動機(jī)冷卻泵，以改善燃油經(jīng)濟(jì)性和提高功率.%(vW1@mv([l%RZZ~z。

3.be great for 對..很好

例句：It was great for me, too.
這對我來說，也是很好的0MC4^l9a-V&XK@R。

4.limited time 有限的時間

例句：How will you use the limited time you have?
你將如何使用你所擁有的有限的時間？