Euglenophyceae
裸藻纲
🗣️ 情景例句
This has been a hard course for me.
这门课对于我来说很难。
In for a penny,in for a pound.
做事一开头，就要做到底；一不做，二不休。
the waters flow more quietly, and in the end, without any visible break,
河水流得平缓起来，最后连绵不断地