The government should not be too optimistic!
政府は楽観的になりすぎるな！
Although the Japanese economy is now growing due to a last-minute surge in demand ahead of a consumption tax hike, the GDP pickup could be decelerated, if consumer spending runs out of steam after the tax hike.
消費税増税前の駆け込み需要の増大により今日本経済は成長しているが、増税後に消費支出が勢いを失えば、GDPの伸びは減速しかねまい。
a last-minute surge in demand 駆け込み需要の増大
accelerate 加速する⇄decelerate 減速する
run out of steam 勢いを失う 失速する
