虽然robbery可以用Steal来解释，但是明确的说明了often by using force or threats.
而steal一般是偷偷摸摸地
robbery /?r?b?r?/
1.
N-VAR Robbery is the crime of stealing money or property from a bank, shop, or vehicle, often by using force or threats. 抢劫; 抢劫罪
例：
The gang members committed dozens of armed robberies over the past year.
该团伙成员在过去一年中犯下了数十起持械抢劫罪。
------------------------------
rob /r?b/
1. V-T If someone is robbed, they have money or property stolen from them. 盗窃; 抢劫
例：
Mrs. Yacoub was robbed of her designer watch at her Westchester home.
雅各布夫人的名牌手表在她威斯特切斯特的家中被人盗走了。
2. V-T If someone is robbed of something that they deserve, have, or need, it is taken away from them. 抢走
例：
When Miles Davis died jazz was robbed of its most distinctive voice.
当迈尔斯?戴维斯去世时，爵士乐里最具特色的声音也被夺走了。
steal /sti?l/
1.
V-T/V-I If you steal something from someone, you take it away from them without their permission and without intending to return it. 偷
例：
He was accused of stealing a small boy's bicycle.
他被指控偷了一个小男孩的自行车。
例：
People who are drug addicts come in and steal.
吸毒成瘾的人们进来偷东西。
2. stolen ADJ 被盗的
例：
We have now found the stolen car.
我们现已找到被盗的汽车。
3. V-T If you steal someone else's ideas, you pretend that they are your own. 剽窃
例：
A writer is suing director Steven Spielberg for allegedly stealing his film idea.
一个作家正在控告史蒂文·斯皮尔伯格导演剽窃了他的电影创意。