Language Point 48
...he had established the existence of one class of Fuchsian functions. (Para. 5)
existence: n. the fact or state of existing
This is the oldest steel bridge in existence.
這是現(xiàn)存的歷史最悠久的鋼橋。
Some people think that it is difficult to prove the existence of the unconscious mind.
有人認(rèn)為難以證實(shí)潛意識的存在。