搜尋標籤: "mouth"

We have to create a sterile field before we perform experiments on microorganisms, this is to ensure no contamination of apparatus by other microorganisms during the operations. This video introduces…

在進行微生物實驗之前，我們必須建立一個無菌區域；實驗過程中亦要確保各操作和工具不被細菌污染。本短片介紹無菌技術的細節，例如：如何建立無菌區域，如何消毒容器的開口、接種環及塗抺棒。

By watching John and his friends playing a football match, pupils can hear and learn some useful idioms to express their feelings, such as being happy, upset, angry, afraid, worried and nervous.

1. Learn about the idioms connected with facial and body parts such as eyebrows, hands and ears, etc. 2. Ask for and give explanations of the hidden meanings of the idioms, e.g., keep your ear to…