Three seats available.

有三个座位。

youdao

Current NASA plans call for four space station crew members to go up at a time, which would leave up to three seats available for space tourists.

目前美国宇航局需要一次能向空间站运送4名机组人员的太空舱，同时留3个席位给太空游客。

youdao

But even in the geographically-based constituencies, a complicated proportional representation system means that on Hong Kong island itself, for example, the pro-government camp won three of the six available seats despite getting less than 40% of the votes.

ECONOMIST: Hong Kong's election

There were 200 requests for the 40 press seats available on Obama's plane, and all three top network anchors (Katie Couric, Charles Gibson and Brian Williams) made the trip and are broadcasting live from each country Obama visits.

CNN: Commentary: Coverage of Obama trip almost embarrassing