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• The first reason.
• The first reason is the raised life.
• The first reason is that the living condition is improved.

important reason	570.04	This is the most important reason.
main reason	453.44	There are two main reasons.
second reason	233.20	The second reason.
first reason	155.46	The first reason.
following reason	155.46	My stand is based on the following reasons.
the reason	142.51	There are the several reasons.
political reason	90.69	there must be a political reason in history.
above reason	64.78	Besides these two reasons above, there was other reasons.
third reason	64.78	The peace is the third reason.
basic reason	51.82	The basic reason, I think, is the developing of industry.