couldn't be better/worse/more pleased etcVERYused to emphasize how good, bad etc something is 非常好/糟/开心等 Their lifestyles couldn’t be more different. 他们的生活方式截然不同。
‘How are things?’ ‘Fine! Couldn’t be better.’ “近来怎么样？”“好！非常好。”
Ordering online couldn’t be simpler. 网上订购再方便不过。
→ couldn’t be better/worse/more pleased etc at could(1)