a line in the sand造句

• We also wish to mention that we are speaking as if today is a line in the sand
  我们也正想要提起，我们正在说的就好像今天是在沙中的一条线。
• But at some point, before too much code gets written, it is important to draw a line in the sand and create a requirements baseline
  但在某些点上，在编写大量代码之前，必须在沙滩上划出一条线来，建立需求的基线。