Number of different species: 50, 000 in the light zone of the ocean alone.

不同种类数量：仅在海洋光区就有50 000。

youdao

Up to now, the Internet has been a light-touch regulatory zone, and free-market advocates have argued that its success depends on an approach that is largely hands-off.

FORBES

It stayed away from a high pressure zone with light winds off Nova Scotia, and built up a big enough lead to withstand the challenge from Silk Cut which was in the right place to benefit from the conditions in the second half of the leg.

BBC: Leg Eight: Toshiba snatches victory

The core area and buffer zone have only light infrastructure dedicated to research, public use, institutional events and surveillance activities.

UNESCO: EDUCATION