They had no choice but to build the pipes above ground and then cover them with dirt.
他们别无选择，只能把管道建在地面上，然后用泥土覆盖。
They may be no less serious than traditional courses, but they certainly cover new academic ground.
这些课程可能不比传统的课程逊色，而它们的确涉及到了新的学术领域。
Top dressing, adding soil and sand that trickle through grass and ground cover plants is not just necessary for proper drainage, but for plant and grass health.
追肥，增加土壤和沙，通过种草，地面覆盖植物涓滴不只是适当的排水必要的，但工厂和基层健康。
Like all bears, the black bear is timid, clumsy, and rarely dangerous, but if attacked, most can climb trees and cover ground at great speeds.
像所有的熊一样，黑熊胆小，笨拙，很少具有危险性。但如果受到攻击，大部分黑熊会以很快的速度爬上树和奔跑。
She complexion equanimity, match eyes, long long of the hair spread out to cover with on the ground, it is to leave me to seem to be not, but just asleep general.
她面色平静，合着眼睛，长长的头发散开披在地上，似乎不是离开了我，而只是睡着了一般。
Both hunts continue to operate under an exemption ruling but because they are required to dispatch a stag as soon as reasonably possible, hunts are shorter and cover less ground.
两个猎鹿组织取得豁免权仍然能打猎，但是因为它们必须尽快将目标鹿赶离鹿群，打猎时间比较短，地域也变小了。
Ground squirrels, for example, use alarm signals when a predator is lurking nearby, not only to warn their peers, but also to make it known to the attacker its cover is blown.
例如，地松鼠发现捕食者在附近潜伏时会发出报警，不仅是为了警示它们的伙伴，而且还让攻击者知道自己的隐蔽已是枉然。
Ground squirrels, for example, use alarm signals when a predator is lurking nearby, not only to warn their peers, but also to make it known to the attacker its cover is blown.
例如，地松鼠发现捕食者在附近潜伏时会发出报警，不仅是为了警示它们的伙伴，而且还让攻击者知道自己的隐蔽已是枉然。
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