When the turtles were exposed to a magnetic field characteristic of a coastal area about 209 miles north of their homes , they invariably swam southward .
当海龟被放置到具有位于它们老家以北209英里的沿海地区为特征的磁场中时,它们总是向南游。
Since then american officials have made bigger efforts to halt the southward flow of guns and money to the drug industry .
此后,美国官员在阻止枪支和金钱向南流向贩毒团伙方面做出了巨大的努力。
On may 29 , looking southward from a vantage point about 350 kilometers above the southern indian ocean , astronauts onboard the international space station watched this enormous , green ribbon shimmering below .
As the road arcs southward , following the course of the great bend of the yellow river , occasional travellers can be found in the near-deserted service stations .
沿着黄河大拐弯,道路也随之向南,在临近沙漠的服务区可以见到零星的游客。
As oceans warm , this species is prospering , expanding its range southward .
随着海洋变暖,这种动物正大量繁殖,它的生存范围已经在向南延伸。
In the northern hemisphere , between 1 and 2 percent of all the icebergs reach southward to 48 degrees north .
在北半球,冰山总计的百分之一到二会向南漂流至北纬48度。
In future , when they return to africa in autumn , the predicted southward extension of the sahara desert may also eventually increase their travel distance .
在将来,当它们在秋天返回非洲的时候,预言向南扩张的撒哈拉沙漠最后也可能将增加它们的行程。
Normally , icebergs remain in place and cannot resume moving southward until they 've melted enough to refloat or a high enough tide frees them .