Life advice: Children's primary school time is precious, parents and friends should not waste it in vain! Life advice: Children's primary school time is precious, parents and friends should not waste it in vain! Life advice: Children's primary school time is precious, parents and friends should not waste it in vain! Life advice: Children's primary school time is precious, parents and friends should not waste it in vain! Life advice: Children's primary school time is precious, parents and friends should not waste it in vain!