The types of molecules that can do this are themselves substantially hydrophobic in nature such as carbon dioxide, oxygen or ethanol.疑问:这句话中 themselves 是做表语么?那么 substantially hydrophobic 又是什么成分?
A recent UN report criticised the use of facial recognition by police in south Wales during a peaceful demonstration as disproportionate and unnecessary.as 这里是介词吗?后边省略了demonstration, 也省略了冠词?