1.The disappearance of Saudi journalist Jamal Khashoggi is descending into greater mystery.
descend into 落入
Then they start to descend into brinkmanship.
然后他们就沦落到开始玩起边缘政策 。
2.US President Donald Trump threatened "severe punishment" if Saudi Arabia was involved in any wrongdoing.
be involved in 涉及到;卷入
She wants to be involved in every area of your life.
她想参与入你生活中的方方面面 。