Gap is known till

Gap is known till A friend is known till needed A friend is never known till / until a man has need. A friend is never known till a man has need翻译下! A friend is never known till a man has need.每个单词所对应的词性 gap gap gap gap Till good is better It is well-known till till as is known,it is known不同用法? As is known 还是It is known英语 it is well known that newton one of the greatest scientists.is known for is known as is known to is known by Venice is known as( )London is known as(Venice is known as( )London is known as( )求了