学校管理部门已经决定强制要求每个学生每年参加该镇众多志愿者项目的其中一个，志愿工作时长至少要达到40个小时。
The school administration has decided to make it mandatory for each student to volunteer at least 40 hours per year to one of the town's many volunteer programs.
要降低较高的失业率和贫困率，该国的年增长率至少要达到5%。
The economy needs to grow by at least 7% per year to make a dent in high unemployment and poverty levels.
美国睡眠药物学会建议，青少年每晚睡眠时间至少要达到9个小时。
The American Academy of Sleep Medicine recommends that adolescents should sleep at least nine hours or more a night.
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