Ottawa and Washington have to find a delicate balance between the freeflow of commerce and legitimate security concerns.
渥太华和华盛顿必须在自由贸易流通和司法安全事务之间找到一个微妙的平衡。
《柯林斯英汉双解大词典》
2
While previously the gap between the continents had allowed a freeflow of water, now the isthmus presented a barrier that divided the Atlantic Ocean from the Pacific Ocean.
以前，大陆之间的鸿沟允许水自由流动；而现在地峡形成了一道屏障，把大西洋和太平洋分隔开来。
3
Ensure there is a freeflow of air around the machine.