"the whole argument rested on a basis of conjecture"
"it was built on a base of solid rock"
"he stood at the foot of the tower"
"we are prepared today because of groundwork that was done ten years ago"
来自柯林斯例句
来自柯林斯例句
来自柯林斯例句
来自《权威词典》
来自《简明英汉词典》