The researchers measured the retreat of the permafrost border byobserving hummocks known as "palsas, " which form naturally over icecontained in the soil of northern peat bogs.

研究人员通过观测被称为泥炭丘的小丘来测量永冻带边界北退的程度，泥炭丘是在北部泥炭沼泽含冰的土壤上自然形成的。

youdao

Loosen the soil in the entire planting area with a claw, border fork or hand trowel until it is smooth and light-almost fluffy.

松土，用耙或土叉把准备耕种的地全部耙松，尽量平整松散。

youdao

It was convenient for him to be able to point to the border incident over the tree as evidence of the need for his guerrillas to "resist Israel" and guard "Lebanon's holy soil".

这很方便让他把这次因为一棵树导致的越境事件作为证据，证明其游击队“反击以色列”和保卫“黎巴嫩神圣国土”的必要性。

youdao

Many crossed the border, but a significant number opted to camp on the Syrian side of the border - preferring to remain on Syrian soil as long as possible.

BBC: Syria: Refugees flee border camps as troops deploy

However fans will have forgiven him for this after all they had just beaten Pakistan 2-1 which was India's maiden Test and one-day series victories on Pakistani soil in the first full tour across the border in 14 years.

BBC: SPORT | Cricket | India left on the Wright track

Two border guards were waiting as soon as he stepped on Canadian soil to ensure he had the correct paperwork.

CNN: Daredevil completes walk across Niagara Falls