Threat of substitute products: a segment is unattractive if there exists actual or potential substitutes for the product &this placealimiton the potential prices &profits.
替代产品的威胁：如果存在现有的或潜在的替代品，区间也不怎么有吸引力，因为潜在的价格和利润很有限。
2
They would placealimiton immigration from outside the European Union, a misguided idea that Mr Cameron has at least taken care to justify in terms of demographic change rather than race.
他们还会限制非欧盟成员国移民，这是一种错误的观点，卡梅隆起码从人口变化而不是种族方面证明了这一点。
3
Many servlet containers placealimiton the amount of memory that can be used across all sessions, and when that limit is reached, will serialize the least recently used session and write it to disk.