1.difficult to say 很难说
例句：It's difficult to say,and I have to think about it.
这不太好说，我需要考虑一下。

2.dash with 掺入
例句：His long, brown hair and beard were all flecked and dashed with white;
长长的棕色须发已然斑白。

3.lean upon 倚靠
例句：You lean upon a broken reed , if you trust to their compassion.
你若指望他们的同情，那你就等于倚在破苇杆上。

4.be dying from 因...而死
例句：And now some of them seem to be dying from their version of AIDS.
而且现在已有一些黑猩猩感染猿类艾滋病而死亡。