1. leave a mark on 留下痕迹
The scandal left a mark on his reputation.
那件丑事玷污了他的名声yZH_N3ZxR.Yc。

2. ripple across 波及
But the research also suggests damage caused by ocean acidification could ripple across economies around the world.
但研究还表明海洋酸化所造成的损害，可能波及世界各地的经济x0bUei5y_Xo=。

3. show no sign of 丝毫没有显示出……的迹象
So far, they show no sign of acknowledging this.
事情发展到现在，依然没有任何表明他们愿意承认这一点的迹象UG^9Vj(icBl](_]N5b2d。

4. sticking point 症结；关键
That's been a major sticking point between the White House and leading Republican law makers.
主要的症结就出在白宫和共和党的主要法律制定者们身上WsF~~xD5tAZ)。