The claim is a stark contrast to previous theories that Hitler's anti-Semitism was spawned on the back streets of Vienna when he was a down-and-out in the lead up to 1914.请解释lead的意思，并翻译一下when he was a down-and-out in the lead up to 1914.

lead在此是“通向”的意思。

when he was a down-and-out in the lead up to 1914.
1914年前希特勒穷困潦倒。

再举几个含“in the lead up to”的例子：
1.The international media showed intense interest in Hong Kong in the lead -up to, and during, the Handover.
对于在回归前及回归期间的香港，国际传媒尤为关注。

2.In the lead-up to the Olympics, it is reasonable to expect large investment, particularly in non-dwelling and hotel construction.
奥运会之前，举办国自然会进行大规模投资，尤其是在非住宅建设和旅馆建设领域。

3.in the lead up to the beijing 2008 olympics, the emblem will attract more and more people from around the world to beijing and china to join the great celebration with the chinese people.
在通往“北京2008”的路程上，人们将通过它相约北京、相聚中国、相识这里的人们。