按时间长短可分为植树日、植树周或植树月，总称植树节。
According to the length of time, people have Tree-planting Day, week or month to plant trees, and all of them call Tree-planting Day.
他们植树于房屋四周。
每年这一周期间，我们诚意邀请您参与此项植树活动。
You are invited to get involved and be part of this planting effort during this week each year.
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