side by side肩并肩,一个挨一个
step by step逐步
all the time一直,始终
once in a while偶尔,有时
word for word逐字地
in demand有需要,销路好
primary school小学
side by side肩并肩,一个挨一个
step by step逐步
all the time一直,始终
once in a while偶尔,有时
word for word逐字地
in demand有需要,销路好
primary school小学