He passed like a shadow under the darkness of the tree and crouched, looking down at the trodden ground at his feet.

他象幽灵似地穿过树下的黑暗处，蹲着身子，低头察看脚下被踩踏过的土地。

youdao

They left under the cloak of darkness.

他们在黑暗的掩护下离开了。

《牛津词典》

Later, under cover of darkness, they crept into the house.

后来他们在夜幕的掩护下溜进了房子。

《牛津词典》

Words like these come to mind as visitors enter a world of silence, darkness and cold, almost two hundred thirty meters under the ground.

VOA: special.2009.12.07

Three helicopters initiated a heated gunbattle with captors under the cover of darkness in the town about 75 miles northwest of the capital Mogadishu, eyewitnesses said.

CNN: STORY HIGHLIGHTS

Apparently that actually happened, sometimes under the cloak of darkness, resulting in pressure on the home-course super to goose up speeds by whatever means necessary, even if that meant scalping the greens or taking other measures likely to cause long-term damage.

WSJ: Ta-Da! The USGA Gives the Stimpmeter a Makeover | Golf Journal by John Paul Newport

"Their cowardly actions, carried out under the cover of darkness, are in stark contrast to the bravery demonstrated on the battlefields by our war heroes, " he said.

BBC: Orange order memorial damaged in Coleraine