感恩先烈，英文可以说成 "show gratitude to the martyrs" 或 "pay tribute to the heroes"。这些表达都传达了敬意和感激之情，适用于不同的语境和场合。

1. We should always remember to show gratitude to the martyrs who sacrificed their lives for our country.

2. It is important that we pay tribute to the heroes who have laid down their lives for our freedom and prosperity.

3. As a society, we must honor the legacy of the martyrs and learn from their selfless dedication.

这些例句可以帮助你更好地表达感恩先烈的意思。