acute disease急性病

chronic disease 慢性病

adhere to 坚持不懈

build a sound body 强身健体

character building 品格培养

chemical substance 化学物质

ease the strain 减轻压力

engage in 参加，从事

outlook in life 人生观

persevere in 坚持

physical condition 身体状况

physical exercise 体育运动

physical-fitness program 健身计划

the average life expectancy 平均寿命