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重点讲解：
1. at risk of 处境危险；有风险的；在危险中；
A suppressed immune system puts a transplant recipient at risk of other infections.
接受器官移植的病人免疫系统受到抑制后很可能会感染其他疾病。
2. at ease （使）自在；（使）安逸；（使）不拘束；
It is essential to feel at ease with your therapist.
在治疗师面前放松下来是很重要的。
3. come forward 自告奋勇；主动提供(信息)；
Investigations have ground to a standstill because no witnesses have come forward.
调查陷入停滞，因为没有证人站出来。
4. fall short of 未达到；不符合；
The hotel fell far short of their expectations.
旅馆远没有他们预期的那么好。
