讲解：
amass sth
(尤指大量)积累,积聚
He amassed a fortune from silver mining.
他靠开采银矿积累了一笔财富。

a level playing field
人人机会均等
The sports game should keep a level playing field.
体育比赛应该保证人人机会均等。

be on trial
受审
(法院的)审讯,审理,审判:
He's on trial for murder.
他因涉嫌谋杀罪而受审。

under threat
凶兆；征兆:
These ancient woodlands are under threat from new road developments.
新道路的发展可能对这些古老的林地造成破坏。

hold sb / sth back
妨碍进展:
Do you think that mixed-ability classes hold back the better students?
你认为把不同能力的学生混合在一起的班级会妨碍较高水平学生的进步吗？

at the cost of
(为做某事涉及的)努力,代价,损失:
She saved him from the fire but at the cost of her own life (= she died).
她从火中把他救了出来,却牺牲了自己的生命。