Sheldon:Romantic love as the basis for marriage has only existed since the 19th century.
人们从19世纪开始才把浪漫爱情作为婚姻的基础。
她只靠牛奶生存。
她只能靠喝牛奶活命。
So there was only one possibility left. God had always existed.
那么就只有一个可能性了：上帝是从来就有的。
Lycurgus, if only be had existed, would have been a still more notable example.
莱库格斯如果确有其人的话，就更是一个显著的例子了。
A molecule that until now existed only in theory has finally been made.
到目前为止，理论上存在的分子终于被制造出来。
At that time, there was only one continuous road that existed in the us.
当时，只有一条连续的道路存在于美国。
At that time, there was only one continuous road that existed in the us.
当时，只有一条连续的道路存在于美国。
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