事实上，周末我去餐馆吃中饭，点了鲈鱼，他们问我，是喜欢普通的还是无铅的。
In fact, when I went to lunch this weekend and ordered the sea bass, they asked if I wanted it regular or unleaded.
表层土是非常珍贵的资源，我们不可能找来足够的表层土去覆盖那些受过铅污染的区域。
Topsoil is a precious resource, and we don't have enough topsoil to replace it.
表层土是非常珍贵的资源，我们不可能找来足够的表层土去覆盖那些受过铅污染的区域。
Topsoil is a precious resource, and we don’t have enough topsoil to replace it.
应用推荐