reveal even more surprises ahout a world that is still full of mysteries，Fornari says.It might also make the job of exploration a little easier.“We take so much for granted on land,” Fornari says.“We can walk around and see with our eyes how big things are. We can see colors，special arrangements.”

Size-wise，the new HOV will be similar to Alvin.It’ll be about 37 feet long.The setting area inside will be a small sphere，about 8 feet wide，like Alvin，it’ll carry a pilot and two passengers.It will be just as maneuverable.In most other ways，it will give passengers more opportunities to enjoy the view，for one thing.Alvin has only three windows，the new vehicle will have five，with more overlap so that the passengers and the pilot can see the same thing.

Alvin can go up and down at a rate of 30 meters every second，and its maximum speed is 2 knots (about 2.3 miles per hour)，while the new vehicle will be able to ascend and descend at 44 meters per second.It’ll reach speeds of 3 knots，or 3.5 miles per hour.

词汇：

fraction/5frAkFEn/n.一部分 dive/daiv/v.& n.潜水;跳水

underwater/5QndE5wC:tE(r)/adj. bound/baund /adj.受约束的，一定的

水下的;adv.在水下

sphere/sfiE(r)/n.球体;范围 manned/5mAnd/adj.载人的

maneuverable/mE5nu:vErEbl/adj. undersea/5QndEsi:/ adj.海底的

机动的，可调动的 submersible/sQb5mE:sEbl/n.潜艇;潜水器

overlap /5EuvE5lAp/v.& n.重叠 upgrade/5Qp^reid/n.升级