1 . 面对流浪动物们 (stray animals) 遭受 (suffer) 饥饿与无家可归的情形，上周末我校学生会 (the student union) 开展了主题为“帮助流浪动物”的活动。(汉译英)

2 . As we explore the world in greater depth, we may reach a point ________ it is impossible to run an experimental scenario in the real world due to physical, ethical or financial limitations. (用适当的词填空)