heavy的用法：
（1）These scissors are awfully heavy
这把剪刀太沉了。
（2）How heavy are you?
你有多重？
（3）It is advisable to mix coarse grit into heavy soil to improve drainage.
建议将粗砂掺到黏重的土壤里，以提高排水性能。
（4）The air is heavy with moisture
空气的'湿度很大。
（5）Her breathing became slow and heavy.
她的呼吸变得缓慢而粗重。
