Translate the following sentences into Chinese ( 注意被动语态 ) 1. While space travel still gets a lot of attention, not enough attention has been accorded to a major new expedition to the deepest point in the ocean, ... 2. The main costs of space exploration arise from the fact that we are set on sending humans, rather than robots. 3. Space vehicles for humans must be made safe, while we can risk a bunch of robots without losing sleep. 4. Ocean organisms are said to hold the promise of cures for an array of diseases.