The Thirty Meter Telescope's massive primary mirror has 492 segments, all perfectly aligned to form a 30-meter (98-foot) light-collecting surface.
30米望远镜的巨型主镜分割成了492块，完美地排列从而形成30米(98英尺)的集光面。
2
But it had buoyed to the surface just as the squall sprang up, and with 30-knot winds and four-foot swells that splashed over the stern, it was too dangerous to retrieve the sub.
但潜艇刚刚浮上水面，暴风就凶猛来袭，30节的风速和足有四英尺高的巨浪就扑到了船上。
3
Growing to about a foot (30 centimeters) long, blind snakes act a lot like worms, burrowing under the surface of every continent except Antarctica.