visual ground sign 地面定向标志 ; 可见地面目标
under-ground sign 地下标志
on-ground sign 地面标志
above-ground sign 地上标志
On the ground, correspondents say there is little immediate sign of a co-ordinated relief effort.
记者在现场报道,那里几乎没有明确的协调救援工作开展的迹象。
Experts are watching carefully for any sign indicating that the ground is shifting.
专家们正在仔细观察任何可能昭示着巨大改变即将到来的信号。
There were few lines at polling stations, said on-the-ground witnesses, a sign that a significant portion of the electorate had chosen not to vote.
投票站很少有排队的,现场目击者说,表明绝大多数选民选择不去投票。
That means early signs of economic recovery, like the way plants begin to shoot up from the ground as a sign of spring.
VOA: special.2009.05.08
Remember, you've got to keep track of the sign of acceleration, so if you're picking up speed towards the ground, a is negative, so it will be g plus a, but a is a negative number.
记住,一定要注意加速度的符号,所以当你加速下降的时候,a 是负的,还是 g 加上 a,但是 a 是负数
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