its a secret
這是一個(gè)秘密
For instance, a band touring in chicago might invite only its biggest fans there to a secret show, or offer them premium merchandise.
例如,一個(gè)到芝加哥巡演的樂隊(duì)只邀請(qǐng)他最鐵的粉絲參加一個(gè)秘密的秀,或者提供他們優(yōu)惠商品.
The secret to a diamond's hardness is its atomic arrangement.
鉆石硬度的秘密在于它的原子排列.