物理学和数学之间的界限并不像我们想象的那么清晰。
The boundary between physics and mathematics is not as clear-cut as we might think.
Thank God, under our Constitution there was no connection between church and state.
如果我能用语言表达，就没有理由画画了。
如果你不能把它变得简单明了，那说明你还没有理解它。
水果产业要发展，必须从种植源头抓起，品质是生命线。