หน่วยที่ 3 เรื่องสิ่งแวดล้อมรอบตัวฉันมีประโยชน์มากมาย
ส่งแผนค่ะ
កាលបរិច្ឆេទឈប់ទទួលប្រកាសបានដល់ហើយ ដូច្នេះអ្នកមិនអាចដាក់ប្រកាសក្នុងវេទិកាទៀតទេ។
ការពិភាក្សាត្រូវបានបិទ ដូច្នេះអ្នកមិនអាចឆ្លើយតបទៀតទេ។