The primary mirror is made up of 18 different segments.

主镜由 18 个不同的部分组成。

Each mirror had to be aligned to within the billionth of a meter, to form a single, primary mirror.

每面镜子都必须对齐到十亿分之一米以内，以形成一个单一的主镜。

The primary mirror of the James Webb Space Telescope will be 25 square meters, so a strong emergence expect for even higher-quality results.

而其接班人詹姆斯·韦伯太空望远镜将达到25平方米，因此呈现给人们的是更高质量的照片。

Two days later, the primary mirror will begin to swing two hinged sections into place to create the complete 6.5-metre-wide mirror.

两天后， 主镜将开始将两个铰接部分摆动到位， 形成完整的 6. 5 米宽镜子。

Much of Webb's power comes from its massive primary mirror, which is more than 21 feet wide, giving it more than six times the light collecting area.

韦伯的实力来自于其巨大的主镜。它的主镜宽度超6.4米，把集光面积扩充了6倍多。

Ten days after launch, if all goes well, Webb will move its small secondary mirror to face its giant primary mirror, which will still be folded up.

发射十天后， 如果一切顺利， 韦伯将把它的小副镜移到面对它的巨大主镜， 主镜仍然是折叠的。