Mathematicians are familiar with this; common problems in algebra are more tractable when considered over the complex numbers than over the reals, even though complex arithmetic is more difficult.

数学家对此很熟悉；如果将代数中的常见问题考虑成复数而不是实数时，那么这些问题就更容易处理，尽管复数算法较难。

youdao

Though the complex is adjoined to Louisville International Airport and shares its two runways, its size overshadows the passenger terminal.

ENGADGET: Inside UPS' Worldport: How a shipping titan moves 2,000 packages every 17 seconds

The issue of change though is more complex than the iPad replacing the PC or of emerging market preferences for smartphones, two explanations offered for declining PC shipments.

FORBES: So If The PC Is Dying, What Happens With Microsoft Next?

Today though a more complex legal issue resurfaced for JPMorgan.

FORBES: JPMorgan's Other Messy Problem: MF Global's Missing Money