bù rù hǔ xué, yān dé hǔ zǐ
不 入 虎 穴， 焉 得 虎 子

Nothing ventured, nothing gained.

解释 ( paraphrase )
不进老虎住的山洞，怎能捉到小老虎呢？
这条言语告诉我们：只有勇于探险，不怕风险，才能取得成功。

This proverb tells us that one cannot expect to achieve success without experiencing difficulties and risks; only those who are bold in exploring and not afraid of hardships and dangers can achieve success.

穴：岩洞、山洞。
      Cave, den.

焉：是疑问代词“怎么”的意思。
      An interrogative pronoun meaning “how?”.

焉得：怎么能得到。
         How can you obtain…?

近义词 ( synonym )
亲临其境

反义词 ( antonym )
胆小如鼠

造句 ( example )
证券投资是风险投资，冒险的精神是必须要有的，不入虎穴，焉得虎子？