Dawn in, I heard a long whistle pierced the morning calm, beautiful rivers and lakes like a morning song.

晨曦中，一声长长的汽笛划破清晨的宁静，似一首美妙的水乡晨曲。

youdao

The sea was extraordinarily calm that morning.

那天清晨，大海出奇地宁静。

《新英汉大辞典》

His family says that Ivan's power is strongest in the morning and when he is calm and focused.

他的家人说Ivan的力量有两个时间最强，分别是早上，以及在他最安静注意力最集中的时候。

youdao

The next morning I expected more of the same, but to my surprise she was calm, even peaceful.

VOA: special.2009.11.08

As a tense morning calm settled over the capital, Tehran, the release of the final official count appeared to have been delayed.

ECONOMIST: Iran's election

Korean Air's Morning Calm members need to fly 50, 000 miles to become SkyTeam Elite members, while their Delta brethren earn the same privileges with just 30, 000.

CNN: ASIANOW - TIME Asia | Travel Watch | Getting Maximum Mileage from Air Miles

Canadian Virginia Bennett, who lives in one of the residential apartments facing the River Thames, was getting ready to take her dog Abby for a walk when the morning calm was shattered by "the noise of metal crashing".

BBC: London helicopter crash: 'Flaming debris' over Vauxhall