Rising costs are threatening the viability of many businesses.不断上涨的成本正在威胁许多企业的生存。
biologyspecialized能生长发育;可以存活
ability to continue to exist or develop as a living being
As the world population of Hawaiian geese has shrunk to very small numbers, the bird's continuing viability is in doubt.全球范围内夏威夷雁已经所剩无几，这种鸟能否继续繁衍下去让人怀疑。