长期投资通常比短期投机更稳定可靠。

Long-term ___investments are usually more stable and reliable than short-term speculation.

购买这套房产是一个明智的投资，因为该地区正在快速发展。

Buying this property is a smart ___investment because the area is developing rapidly.

她在健身上的投入让她成功跑完了半程马拉松。

Her ___investments in fitness paid off when she completed the half marathon.