因为两个清辅音连在一起，后面一个要读浊辅音。
Spring came late this year.
今年春天来得晚。
He was born in the spring of 1944.
他生于1944年春。
Trade usually picks up in the spring.
贸易一般在春天回升。
I love Rome， especially in the spring.
我喜爱罗马，尤其是春天的罗马。
Spring is here and romance is in the air.
春天来了，到处洋溢着爱情的气息。
