擅长:python、mysql、java
<p>试试这个</p>
<pre><code>translation = input("Word: ")
count = 0
previous = []
while translation != "":
if translation not in previous:
count = (count - 1)
previous.append(translation)
translation = input("Word: ")
print("You know", count, "unique translation(s)!")
</code></pre>