1、discover

发现(以前不知道的事实)

She discovered that they'd escaped.

她发现他们已经逃跑了。

I discovered I was pregnant.

我发现自己怀孕了。

(第一个)发现

the first European to discover America.

第一个发现美洲大陆的欧洲人

In the 19th century, gold was discovered in California.

19 世纪时，在加利福尼亚发现了金子。

初次接触(某活动并乐在其中)

I wish I'd discovered photography when I was younger.

我要是早点接触到摄影技术就好了。

Discover the delights and luxury of a private yacht.

体验私人游艇的乐趣和奢华。

2、backward

向后的，往后的（一些人亦使用backwards)

He unlocked the door of apartment two and disappeared inside after a backward glance at Larry.

他打开2号公寓的门，回头瞥了拉里一眼，然后就进了房间。

He did a backward flip.

他做了一个后空翻。

倒退的；不进反退的

At a certain age, it's not viable for men to take a backward step into unskilled work.

到了一定的年龄，就不可能再退回去干不需要技能的工作。

Many dentists will no longer treat National Health Service patients, which is a big backward step in this country.

许多牙医不再为依靠国民保健制度的病人看病，这是该国的一大倒退。

迟钝的；学习吃力的

research into teaching techniques to help backward children.

关于帮助落后孩子的教学方法研究

I was slow to walk and talk and my parents thought I was backward.

我学走路和说话都很慢，所以我父母以为我很迟钝。