a tip of the iceberg

• 很小的一部分

a tip of the iceberg的用法和样例：

例句

1. Each atom would have a very small net charge.
   每一个原子都会有一个很小的净电荷。
2. In addition, you only need to pay a little part of the sum if your credit card or debit card is embezzled.
   另外，如果你的信用卡或借记卡被盗用，你只需承担很小的一部分金额。