🧩 词语组成解析
button
['bʌtn]
n. 按钮，电钮;纽扣，扣子;扣状物;[植]芽;
vt. 用纽扣扣紧;用纽扣装饰，钉钮扣于;在…上装钮扣;
vi. 扣住;装有钮扣;扣上钮扣;
fern
[fə:n]
n. <植>羊齿植物，蕨类植物;
🗣️ 情景例句
Please sit down, Alexandra.
请坐 Alexandra。
I'll have mashed potatoes and green beans.
我要土豆泥和青豆。
The second marks the arrival of transverse vibrations which travel more slowly and arrive several minutes after the first.
然后记录下的是横向波的到达，横向波比纵向波传播得慢，在纵向波到达几分钟后才能到达。